Three-Dimensional Figures
Ever wondered what makes a box different from a pyramid? It's all about their 3D structure! A solid is any three-dimensional figure that encloses space. The most common type is a polyhedron, which is made up of flat polygons called faces.
Where these faces meet, they form edges (line segments), and where edges meet, they create vertices (points). When you connect two vertices that aren't on the same face, you create a diagonal.
Common solids come in different shapes. Prisms have two identical bases with rectangular faces connecting them - like a rectangular box or a triangular prism. Pyramids have just one base with triangular faces that meet at a point - think of the famous pyramids in Egypt!
Fun Fact: Most everyday objects are 3D solids! Your juice box is a rectangular prism, while a party hat resembles a cone. Start noticing these shapes around you!
There are also cylinders with two circular bases, and cones with one circular base that tapers to a point. These rounded solids don't have flat polygon faces like polyhedrons do.
