by 19521chaos July 21, 2025

by 19521chaos July 24, 2025

A polyhedron with 20 faces, usually referring to the triangular icosahedron, one of the five platonic solids. (pl. icosahedra, more rarely icosahedrons)
Examples of icosahedra are the decagonal bipyramid, the decagonal trapezohedron, the octadecagonal prism, the enneadecagonal pyramid, the enneagonal antiprism, and the platonic icosahedron
by 19521chaos July 24, 2025

by 19521chaos July 24, 2025
