Uhľovodíky sú základom organickej chémie a stretávaš sa s nimi... Show more
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Updated Mar 22, 2026
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Uhľovodíky sú základom organickej chémie a stretávaš sa s nimi... Show more











Predstav si uhľovodíky ako stavebnice, kde uhlík tvorí kostru a vodík dopĺňa voľné miesta. Uhlík je vždy štvormocný, takže vytvára presne štyri väzby - to mu umožňuje stavať dlhé reťazce a kruhy.
Organická chémia študuje zlúčeniny uhlíka, ale nie všetky - CO₂ napríklad nepatrí sem. Uhľovodíky sú jej najjednoduchšou časťou, ale super dôležitou.
Kľúčový pojem je homologický rad - skupina zlúčenín s podobnou štruktúrou, ktoré sa líšia len o skupinu -CH₂-. Napríklad metán, etán, propán sú ako súrodenci v jednej rodine.
Tip na zapamätanie: Uhlík = 4 väzby vždy. Bez výnimky!

Alkány sú nasýtené uhľovodíky s len jednoduchými väzbami C-C. Sú to chemické "lenivci" - málo reaktívne, ale zato stabilné. Všeobecný vzorec je CₙH₂ₙ₊₂.
Názvoslovie je jednoduché: koncovka -án. Prvé štyri majú špeciálne názvy - metán (CH₄), etán (C₂H₆), propán (C₃H₈), bután (C₄H₁₀). Od piateho sa používajú grécke predpony.
Izoméria sa objavuje už pri butáne - môže byť rovný alebo rozvetvený (izobután). Rovnaký vzorec, iná štruktúra, iné vlastnosti.
Prakticky ich poznáš ako zemný plyn (metán), plyn do grilu alebo benzín (zmes rôznych alkánov).
Pre skúšku: Vzorec CₙH₂ₙ₊₂ ti hneď povie, že ide o alkán!

Alkény obsahujú aspoň jednu dvojitú väzbu C=C, čo ich robí nenasýtenými a reaktívnejšími. Všeobecný vzorec je CₙH₂ₙ - všimni si, že majú menej vodíkov ako alkány.
Koncovka -én ťa hneď upozorní na dvojitú väzbu. Najjednoduchší je etén (C₂H₄), ktorý sa kedysi volal etylén. Pri dlhších reťazcoch musíš uviesť polohu dvojitej väzby číslom.
Dvojitá väzba je pevnejšia a kratšia ako jednoduchá. Bráni voľnej rotácii, čo môže viesť k cis-trans izomérii - atómy môžu byť na tej istej alebo opačnej strane dvojitej väzby.
V praxi sa etén používa na výrobu polyetylénu (PE) - poznáš ho z plastových tašiek a fólií. Tiež urýchľuje dozrievanie ovocia.
Zaujímavosť: Dvojitá väzba sa dá "otvoriť" pri reakciách, preto sú alkény tak reaktívne!

Alkíny sú majstri reaktivity vďaka trojitej väzbe C≡C. Sú to tiež nenasýtené uhľovodíky s všeobecným vzorcom CₙH₂ₙ₋₂ - majú ešte menej vodíkov ako alkény.
Koncovka -ín ti napovedá trojitú väzbu. Najznámejší je etín (C₂H₂), známy ako acetylén. Trojitá väzba je najkratšia a najpevnejšia spomedzi všetkých C-C väzieb.
Táto extrémna reaktivita má praktické využitie - etín horí s veľmi horúcim plameňom, preto sa používa pri autogénnom zváraní kovov. Dosahujú sa teploty až 3000°C!
Pre chemikov sú alkíny zaujímavé, lebo trojitá väzba sa dá ľahko "otvárať" a pridávať k nej rôzne látky.
Praktická poznámka: Ak vidíš zváračov pri práci, pravdepodobne používajú acetylén!

Arény sú úplne iný svet uhľovodíkov. Obsahujú benzénové jadro - šesťuholníkový kruh šiestich uhlíkov so špeciálnou stabilitou. Elektróny nie sú viazané na konkrétne väzby, ale sú delokalizované po celom kruhu.
Benzén (C₆H₆) je ich král. Znázorňuje sa ako šesťuholník s kruhom vnútri, ktorý symbolizuje tie "putujúce" elektróny. Majú charakteristickú vôňu, preto sa volajú "aromatické".
Deriváty benzénu majú názvy ako toluén (metylbenzén) alebo xylén (dimetylbenzén). Sú stabilnejšie ako bežné nenasýtené uhľovodíky vďaka tej delokalizácii.
V priemysle sa používajú ako rozpúšťadlá a na výrobu farbív, liekov, plastov. Ale pozor - benzén je toxický a karcinogénny!
Bezpečnostné upozornenie: S aromatickými uhľovodíkmi sa pracuje len s ochranými pomôckami!

Teraz si to všetko pekne poukladaj. Alkány (CₙH₂ₙ₊₂) sú najmenej reaktívne, alkény (CₙH₂ₙ) sú stredne reaktívne, alkíny (CₙH₂ₙ₋₂) sú najreaktívnejšie. Arény sú špeciálny prípad s vlastnou logikou.
Reaktivita rastie: Alkány < Arény < Alkény < Alkíny. Čím více násobných väzieb, tým ľahšie reagujú, lebo sa tie väzby dajú "otvoriť".
Praktické využitie je všade okolo teba. Kúriš zemným plynom (metán), tankuješ benzín (alkány), používaš plastové tašky (z alkénov), možno vidíš zváračov (alkíny).
Teploty varu rastú s dĺžkou reťazca - metán je plyn, hexán je kvapalina. Všetky sú nepolárne, takže sa nerozpúšťajú vo vode.
Pre skúšku: Zapamätaj si vzorce - pomôžu ti hneď rozpoznať typ uhľovodíka!

Poďme si to precvičiť na konkrétnych príkladoch. CH₃-CH₂-CH₂-CH₃ má 4 uhlíky a len jednoduché väzby = bután (alkán). C₅H₁₀ podľa vzorca CₙH₂ₙ = pentén (alkén).
Izoméria sa najlepšie pochopí na príklade. Pentán (C₅H₁₂) môže byť rovný reťazec alebo rozvetvený - rôzne usporiadania, ale rovnaký sumárny vzorec.
Tipy na riešenie úloh: Najprv spočítaj uhlíky, potom pozri typ väzieb, použij správny vzorec a názvolosie. Predpony a koncovky sú tvoje najlepšie pomocníci.
Pri kreslení štruktúr si pamätaj - uhlík má vždy 4 väzby. Ak niektorá chýba, dopĺň ju vodíkom.
Skúšobný tip: Naučíš sa najrýchlejšie, ak si kreslíš štruktúry prvých členov každého radu!

Základné info: Uhľovodíky = len C + H, uhlík je vždy štvormocný, rozdeľujeme podľa typu väzieb.
Alkány: Nasýtené, CₙH₂ₙ₊₂, koncovka -án, príklad metán CH₄, použitie palivá. Alkény: Nenasýtené s C=C, CₙH₂ₙ, koncovka -én, príklad etén C₂H₄, použitie plasty.
Alkíny: Nenasýtené s C≡C, CₙH₂ₙ₋₂, koncovka -ín, príklad etín C₂H₂, použitie zváranie. Arény: Benzénové jadro, delokalizované elektróny, príklad benzén C₆H₆.
Reaktivita: Alkíny > Alkény > Arény > Alkány. Všeobecné vzorce ti povedia hneď, o aký typ ide.
Posledný tip: Uhľovodíky sú základ - ak ich pochopíš, zvládneš celú organickú chémiu!


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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
Uhľovodíky sú základom organickej chémie a stretávaš sa s nimi každý deň - sú to hlavné zložky palív, plastov a mnohých chemikálií okolo nás. Sú to jednoducho zlúčeniny obsahujúce len uhlík (C) a vodík (H), ale ich rôzne typy väzieb... Show more

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Predstav si uhľovodíky ako stavebnice, kde uhlík tvorí kostru a vodík dopĺňa voľné miesta. Uhlík je vždy štvormocný, takže vytvára presne štyri väzby - to mu umožňuje stavať dlhé reťazce a kruhy.
Organická chémia študuje zlúčeniny uhlíka, ale nie všetky - CO₂ napríklad nepatrí sem. Uhľovodíky sú jej najjednoduchšou časťou, ale super dôležitou.
Kľúčový pojem je homologický rad - skupina zlúčenín s podobnou štruktúrou, ktoré sa líšia len o skupinu -CH₂-. Napríklad metán, etán, propán sú ako súrodenci v jednej rodine.
Tip na zapamätanie: Uhlík = 4 väzby vždy. Bez výnimky!

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Alkány sú nasýtené uhľovodíky s len jednoduchými väzbami C-C. Sú to chemické "lenivci" - málo reaktívne, ale zato stabilné. Všeobecný vzorec je CₙH₂ₙ₊₂.
Názvoslovie je jednoduché: koncovka -án. Prvé štyri majú špeciálne názvy - metán (CH₄), etán (C₂H₆), propán (C₃H₈), bután (C₄H₁₀). Od piateho sa používajú grécke predpony.
Izoméria sa objavuje už pri butáne - môže byť rovný alebo rozvetvený (izobután). Rovnaký vzorec, iná štruktúra, iné vlastnosti.
Prakticky ich poznáš ako zemný plyn (metán), plyn do grilu alebo benzín (zmes rôznych alkánov).
Pre skúšku: Vzorec CₙH₂ₙ₊₂ ti hneď povie, že ide o alkán!

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Alkény obsahujú aspoň jednu dvojitú väzbu C=C, čo ich robí nenasýtenými a reaktívnejšími. Všeobecný vzorec je CₙH₂ₙ - všimni si, že majú menej vodíkov ako alkány.
Koncovka -én ťa hneď upozorní na dvojitú väzbu. Najjednoduchší je etén (C₂H₄), ktorý sa kedysi volal etylén. Pri dlhších reťazcoch musíš uviesť polohu dvojitej väzby číslom.
Dvojitá väzba je pevnejšia a kratšia ako jednoduchá. Bráni voľnej rotácii, čo môže viesť k cis-trans izomérii - atómy môžu byť na tej istej alebo opačnej strane dvojitej väzby.
V praxi sa etén používa na výrobu polyetylénu (PE) - poznáš ho z plastových tašiek a fólií. Tiež urýchľuje dozrievanie ovocia.
Zaujímavosť: Dvojitá väzba sa dá "otvoriť" pri reakciách, preto sú alkény tak reaktívne!

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Alkíny sú majstri reaktivity vďaka trojitej väzbe C≡C. Sú to tiež nenasýtené uhľovodíky s všeobecným vzorcom CₙH₂ₙ₋₂ - majú ešte menej vodíkov ako alkény.
Koncovka -ín ti napovedá trojitú väzbu. Najznámejší je etín (C₂H₂), známy ako acetylén. Trojitá väzba je najkratšia a najpevnejšia spomedzi všetkých C-C väzieb.
Táto extrémna reaktivita má praktické využitie - etín horí s veľmi horúcim plameňom, preto sa používa pri autogénnom zváraní kovov. Dosahujú sa teploty až 3000°C!
Pre chemikov sú alkíny zaujímavé, lebo trojitá väzba sa dá ľahko "otvárať" a pridávať k nej rôzne látky.
Praktická poznámka: Ak vidíš zváračov pri práci, pravdepodobne používajú acetylén!

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Arény sú úplne iný svet uhľovodíkov. Obsahujú benzénové jadro - šesťuholníkový kruh šiestich uhlíkov so špeciálnou stabilitou. Elektróny nie sú viazané na konkrétne väzby, ale sú delokalizované po celom kruhu.
Benzén (C₆H₆) je ich král. Znázorňuje sa ako šesťuholník s kruhom vnútri, ktorý symbolizuje tie "putujúce" elektróny. Majú charakteristickú vôňu, preto sa volajú "aromatické".
Deriváty benzénu majú názvy ako toluén (metylbenzén) alebo xylén (dimetylbenzén). Sú stabilnejšie ako bežné nenasýtené uhľovodíky vďaka tej delokalizácii.
V priemysle sa používajú ako rozpúšťadlá a na výrobu farbív, liekov, plastov. Ale pozor - benzén je toxický a karcinogénny!
Bezpečnostné upozornenie: S aromatickými uhľovodíkmi sa pracuje len s ochranými pomôckami!

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Teraz si to všetko pekne poukladaj. Alkány (CₙH₂ₙ₊₂) sú najmenej reaktívne, alkény (CₙH₂ₙ) sú stredne reaktívne, alkíny (CₙH₂ₙ₋₂) sú najreaktívnejšie. Arény sú špeciálny prípad s vlastnou logikou.
Reaktivita rastie: Alkány < Arény < Alkény < Alkíny. Čím více násobných väzieb, tým ľahšie reagujú, lebo sa tie väzby dajú "otvoriť".
Praktické využitie je všade okolo teba. Kúriš zemným plynom (metán), tankuješ benzín (alkány), používaš plastové tašky (z alkénov), možno vidíš zváračov (alkíny).
Teploty varu rastú s dĺžkou reťazca - metán je plyn, hexán je kvapalina. Všetky sú nepolárne, takže sa nerozpúšťajú vo vode.
Pre skúšku: Zapamätaj si vzorce - pomôžu ti hneď rozpoznať typ uhľovodíka!

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Poďme si to precvičiť na konkrétnych príkladoch. CH₃-CH₂-CH₂-CH₃ má 4 uhlíky a len jednoduché väzby = bután (alkán). C₅H₁₀ podľa vzorca CₙH₂ₙ = pentén (alkén).
Izoméria sa najlepšie pochopí na príklade. Pentán (C₅H₁₂) môže byť rovný reťazec alebo rozvetvený - rôzne usporiadania, ale rovnaký sumárny vzorec.
Tipy na riešenie úloh: Najprv spočítaj uhlíky, potom pozri typ väzieb, použij správny vzorec a názvolosie. Predpony a koncovky sú tvoje najlepšie pomocníci.
Pri kreslení štruktúr si pamätaj - uhlík má vždy 4 väzby. Ak niektorá chýba, dopĺň ju vodíkom.
Skúšobný tip: Naučíš sa najrýchlejšie, ak si kreslíš štruktúry prvých členov každého radu!

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Základné info: Uhľovodíky = len C + H, uhlík je vždy štvormocný, rozdeľujeme podľa typu väzieb.
Alkány: Nasýtené, CₙH₂ₙ₊₂, koncovka -án, príklad metán CH₄, použitie palivá. Alkény: Nenasýtené s C=C, CₙH₂ₙ, koncovka -én, príklad etén C₂H₄, použitie plasty.
Alkíny: Nenasýtené s C≡C, CₙH₂ₙ₋₂, koncovka -ín, príklad etín C₂H₂, použitie zváranie. Arény: Benzénové jadro, delokalizované elektróny, príklad benzén C₆H₆.
Reaktivita: Alkíny > Alkény > Arény > Alkány. Všeobecné vzorce ti povedia hneď, o aký typ ide.
Posledný tip: Uhľovodíky sú základ - ak ich pochopíš, zvládneš celú organickú chémiu!

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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