A 3D shape with regular polygonal faces, meeting at equal angles, is a platonic solid. There are five platonic solids, the tetrahedron, cube, octahedron, dodecahedron and icosahedron. A prism is a ...

Polygons have names that show the number of sides they have. A three-dimensional (3D) shape is a solid shape. 3D shapes have three dimensions - length, width and depth. Look at the shapes of the ...