Can you see that a triangular prism has 5 faces. It has 2 triangle faces and 3 rectangle faces. When you have the net of a 3D shape, look carefully at the shape of each face and the number of ...

This model resembles a triangular pyramid with a regular tetrahedron on each end. Its faces are three squares and six equilateral triangles. On Berman's models of regular-faced convex polyhedra, see ...

Archaeologists have begun digging for what they think might be a pyramid hidden beneath a hill in Bosnia. Known as Visocica, the 650m (2,120ft) triangular mound, overlooking Visoko, has long been ...