Icosahedron のコピー

Sometimes regular... The vertices of 3 orthogonal congruent rectangles can be [br]connected to make a polyhedron with 20 triangular faces[br](icosahedron). One of the most wonderful facts of geometry [br]is that if those rectangles have the golden proportion, it's the [br]regular icosahedron - a platonic solid!
More GeoGebra at [url]bit.ly/mh-ggb[/url]

Information: Icosahedron のコピー