Faces - A face is a flat surface on a 3D shape. For example a cube has 6 faces. Edges - An edge is where two faces meet. For example a cube has 12 edges. Vertices - A vertex is a corner where ...

Recently, an optical illusion shared on Facebook has once again left users scratching their heads. (Also read: Only a true ...

The nets of 3D shapes help you see some of the properties of the shape. This net of a tetrahedron shows you the shape of each face and the number of faces. Can you see that a tetrahedron has 4 ...