




 inscribed with 3 other platonic solids






 mutually perpendicular edges highlighted






 golden rectangles inscribed






 cross sections parallel to a face






 cross sections parallel to an axis through midpoints of opposite edges.






 cross sections perpendicular to an axis through opposite vertices






 rotation about axis through centers of opposite faces






 rotation about axis through midpoints of opposite edges






 rotation about axis through opposite vertices






 Rotate a regular octahedron about an axis through midpoints of opposite edges.






 Rotate a cube about an axis through opposite edges






 tangent planes of a sphere






 Perspective drawing of a cube






 Perspective drawing of a square 1






 Perspective drawing of a square 2






 Folding two opposite vertices of a square paper






 Make a special triangle with a square paper






