The regular convex polyhedra are the five Platonic solids, which have been known since classical Greece. The ancient Greek mathematician Euclid proved in his Elements of Geometry that there are only ...

Click to see a step-by-step slideshow. STEP 1: On each of the nets, colour in the faces that will make one corner so you can count them easily. STEP 3: Three regular triangles on a corner make a ...

Plato equated the smallest particles of the elements with regular geometric bodies. Like Empedocles he accepted the four traditional elements — earth, water, air, fire — and thus he could ...