Platonic solids are regular, convex polyhedrons. There are five Platonic solids: tetrahedron, cube, octahedron, dodecahedron, and icosahedron.
This tool allows you to view the five Platonic solids in 3D with various rendering options. It can show the front (camera-facing) edges as solid lines and the back edges that are hidden from view as dashed lines. The dashed lines are uniformly dashed relative to the camera.