Now, more than 122 years after it was first proposed, Kamata and two other mathematicians have finally proved that a solution ...

Image caption, The number of edges of a prism is the number of edges of an end face, multiplied by three. A triangular prism has three edges for each end face and a further three for the edges ...

Faces - A face is a flat surface on a 3D shape. For example a cube has 6 faces. Edges - An edge is where ... Right, what about triangles? Triangles become pyramids. You're now a square based ...