Celični organeli so kot specializirani "organi" znotraj vsake celice, kjer... Show more
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Updated Mar 26, 2026
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Celični organeli in njihove ključne funkcije
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Uvod v celične organele
Zakaj se sploh ukvarjamo s celičnimi organeli? Ker so osnova življenja! Celični organeli so specializirane strukture, ki jih najdemo v evkariontskih celicah - torej v celicah rastlin, živali, gliv in protistov.
Evkariontske celice imajo pravo jedro z jedrno ovojnico in organele, obdane z membranami. Mi ljudje smo evkarionti. Prokariontske celice (kot so bakterije) pa so precej preprostejše - nimajo pravega jedra in njihova DNK prosto plava v citoplazmi.
💡 Pomni: Citoplazma je vsa vsebina celice, razen jedra. Tu se "dogajajo stvari"!
Organeli so torej kot majhni oddelki v celični tovarni. Vsak ima svojo membrano (kot svojo pisarno) in svojo specifično funkcijo, ki je ključna za preživetje celice.
Jedro in mitohondrij
Jedro je "šef" celice - največji organel z dvojno membrano in porami. V njem je shranjena DNK, ki vsebuje vsa navodila za delovanje celice. V jedrcu nastajajo ribosomi. Brez jedra bi bila celica kot tovarna brez načrtov.
Mitohondrij je celična elektrarna! Ima dve membrani - zunanja je gladka, notranja pa je nagubana v kriste. Te gube povečajo površino za kemijske reakcije.
Tu poteka celično dihanje, kjer se iz glukoze in kisika sprošča energija in nastaja ATP - glavna "energetska valuta" celice. Vsak proces v celici potrebuje ATP za pogon.
💡 Zanimivost: Mitohondriji imajo lastno DNK in se razmnožujejo samostojno - verjetno so bili nekoč samostojne bakterije!
Kloroplasti in ribosomi
Kloroplasti so samo v rastlinskih celicah in algah - oni so tisti, zaradi katerih so rastline zelene! Imajo dvojno membrano, v notranjosti pa tilakoide, zložene v grane.
Tu poteka fotosinteza: s pomočjo sončne svetlobe, vode in CO₂ nastajata glukoza (hrana) in kisik. Formula: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂. Torej rastline si same "kuhajo" hrano!
Ribosomi so majhni, a izjemno pomembni! Nimajo membrane, lahko pa so prosti v citoplazmi ali vezani na ER. So kot delavci, ki berejo navodila iz jedra in iz njih sestavljajo beljakovine - proces imenovan sinteza beljakovin.
💡 Pomni: Kloroplasti = tovarna hrane, ribosomi = tovarna beljakovin!
Endoplazemski retikulum in Golgijev aparat
Endoplazemski retikulum (ER) je kot transportni sistem celice - mreža membran, ki povezuje jedro z drugimi deli celice.
Zrnati ER ima na površini ribosome in obdeluje beljakovine, ki so namenjene "izvozu" iz celice. Gladki ER pa nima ribosomov - tu nastajajo maščobe, poteka razstrupljanje in se shranjujejo kalcijevi ioni.
Golgijev aparat je celična pošta! Sestavljen je iz sploščenih vrečk (cistern). Sprejme snovi iz ER, jih dodatno obdela, sortira in zapakira v vezikule - majhne transportne "pakete".
💡 Predstavljaj si: ER je kot tovarna, Golgijev aparat pa kot pošta, ki pošlje izdelke na pravo mesto!
Ti vezikuli potem potujejo po celici ali se zlijejo s celično membrano in izločijo vsebino iz celice.
Lizosomi in primerjava celic
Lizosomi so "smetarski servis" celice - majhni mehurčki s prebavnimi encimi. Razgrajujejo poškodovane organele, bakterije in druge odvečne snovi. Njihova notranjost je kisla, kar potrebujejo encimi za delovanje.
Glavne razlike med rastlinsko in živalsko celico so tri: celična stena , kloroplasti in osrednja vakuola .
Oba tipa celic imata jedro, mitohondrije, ribosome, ER in Golgijev aparat. Tudi rastline "dihajo" z mitohondriji - fotosinteza in celično dihanje sta različna procesa!
💡 Za test: Rastlinska celica = živalska celica + celična stena + kloroplasti + velika vakuola
Lizosomi so pogosti v živalskih celicah, v rastlinskih pa to funkcijo večinoma prevzame osrednja vakuola.
Sodelovanje organelov
Organeli ne delajo posamično - sodelujejo kot usklajena ekipa! Poglejmo primer izdelave in izločitve encima iz celice:
Jedro pošlje navodilo (mRNK) → ribosom na zrnatem ER sestavi beljakovino → zrnati ER jo obdela → Golgijev aparat jo zapakira v vezikel → vezikel potuje do celične membrane in izloči encim.
Za teste si zapomni ključne funkcije: jedro (navodila), mitohondrij (energija), ribosom (beljakovine), ER (transport), Golgijev aparat (pakiranje), lizosom (razgradnja).
Endosimbiontska teorija razlaga, kako so nastali mitohondriji in kloroplasti - verjetno so bili nekoč samostojne bakterije, ki jih je "požrla" večja celica, potem pa so ostali v simbiozi.
💡 Hiter povzetek: Jedro = knjižnica, mitohondrij = elektrarna, ribosom = delavec, ER = transportni sistem, Golgijev = pošta, lizosom = recikliranje!
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
Most popular content in Biologija
Most popular content
Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
Celični organeli in njihove ključne funkcije
Celični organeli so kot specializirani "organi" znotraj vsake celice, kjer vsak opravlja svojo posebno nalogo. Predstavljaj si jih kot različne oddelke v veliki tovarni, kjer vsi sodelujejo, da celica lahko živi in deluje. Razumevanje njihovih funkcij ti bo pomagalo razumeti,... Show more
Uvod v celične organele
Zakaj se sploh ukvarjamo s celičnimi organeli? Ker so osnova življenja! Celični organeli so specializirane strukture, ki jih najdemo v evkariontskih celicah - torej v celicah rastlin, živali, gliv in protistov.
Evkariontske celice imajo pravo jedro z jedrno ovojnico in organele, obdane z membranami. Mi ljudje smo evkarionti. Prokariontske celice (kot so bakterije) pa so precej preprostejše - nimajo pravega jedra in njihova DNK prosto plava v citoplazmi.
💡 Pomni: Citoplazma je vsa vsebina celice, razen jedra. Tu se "dogajajo stvari"!
Organeli so torej kot majhni oddelki v celični tovarni. Vsak ima svojo membrano (kot svojo pisarno) in svojo specifično funkcijo, ki je ključna za preživetje celice.
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Jedro in mitohondrij
Jedro je "šef" celice - največji organel z dvojno membrano in porami. V njem je shranjena DNK, ki vsebuje vsa navodila za delovanje celice. V jedrcu nastajajo ribosomi. Brez jedra bi bila celica kot tovarna brez načrtov.
Mitohondrij je celična elektrarna! Ima dve membrani - zunanja je gladka, notranja pa je nagubana v kriste. Te gube povečajo površino za kemijske reakcije.
Tu poteka celično dihanje, kjer se iz glukoze in kisika sprošča energija in nastaja ATP - glavna "energetska valuta" celice. Vsak proces v celici potrebuje ATP za pogon.
💡 Zanimivost: Mitohondriji imajo lastno DNK in se razmnožujejo samostojno - verjetno so bili nekoč samostojne bakterije!
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Kloroplasti in ribosomi
Kloroplasti so samo v rastlinskih celicah in algah - oni so tisti, zaradi katerih so rastline zelene! Imajo dvojno membrano, v notranjosti pa tilakoide, zložene v grane.
Tu poteka fotosinteza: s pomočjo sončne svetlobe, vode in CO₂ nastajata glukoza (hrana) in kisik. Formula: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂. Torej rastline si same "kuhajo" hrano!
Ribosomi so majhni, a izjemno pomembni! Nimajo membrane, lahko pa so prosti v citoplazmi ali vezani na ER. So kot delavci, ki berejo navodila iz jedra in iz njih sestavljajo beljakovine - proces imenovan sinteza beljakovin.
💡 Pomni: Kloroplasti = tovarna hrane, ribosomi = tovarna beljakovin!
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Endoplazemski retikulum in Golgijev aparat
Endoplazemski retikulum (ER) je kot transportni sistem celice - mreža membran, ki povezuje jedro z drugimi deli celice.
Zrnati ER ima na površini ribosome in obdeluje beljakovine, ki so namenjene "izvozu" iz celice. Gladki ER pa nima ribosomov - tu nastajajo maščobe, poteka razstrupljanje in se shranjujejo kalcijevi ioni.
Golgijev aparat je celična pošta! Sestavljen je iz sploščenih vrečk (cistern). Sprejme snovi iz ER, jih dodatno obdela, sortira in zapakira v vezikule - majhne transportne "pakete".
💡 Predstavljaj si: ER je kot tovarna, Golgijev aparat pa kot pošta, ki pošlje izdelke na pravo mesto!
Ti vezikuli potem potujejo po celici ali se zlijejo s celično membrano in izločijo vsebino iz celice.
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Lizosomi in primerjava celic
Lizosomi so "smetarski servis" celice - majhni mehurčki s prebavnimi encimi. Razgrajujejo poškodovane organele, bakterije in druge odvečne snovi. Njihova notranjost je kisla, kar potrebujejo encimi za delovanje.
Glavne razlike med rastlinsko in živalsko celico so tri: celična stena , kloroplasti in osrednja vakuola .
Oba tipa celic imata jedro, mitohondrije, ribosome, ER in Golgijev aparat. Tudi rastline "dihajo" z mitohondriji - fotosinteza in celično dihanje sta različna procesa!
💡 Za test: Rastlinska celica = živalska celica + celična stena + kloroplasti + velika vakuola
Lizosomi so pogosti v živalskih celicah, v rastlinskih pa to funkcijo večinoma prevzame osrednja vakuola.
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Sodelovanje organelov
Organeli ne delajo posamično - sodelujejo kot usklajena ekipa! Poglejmo primer izdelave in izločitve encima iz celice:
Jedro pošlje navodilo (mRNK) → ribosom na zrnatem ER sestavi beljakovino → zrnati ER jo obdela → Golgijev aparat jo zapakira v vezikel → vezikel potuje do celične membrane in izloči encim.
Za teste si zapomni ključne funkcije: jedro (navodila), mitohondrij (energija), ribosom (beljakovine), ER (transport), Golgijev aparat (pakiranje), lizosom (razgradnja).
Endosimbiontska teorija razlaga, kako so nastali mitohondriji in kloroplasti - verjetno so bili nekoč samostojne bakterije, ki jih je "požrla" večja celica, potem pa so ostali v simbiozi.
💡 Hiter povzetek: Jedro = knjižnica, mitohondrij = elektrarna, ribosom = delavec, ER = transportni sistem, Golgijev = pošta, lizosom = recikliranje!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user