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 ...

A pyramid is a 3D shape with a flat base, and triangular edges that meet at a ... Where \(\text{l}\) is the length of the slanted or sloping side. We can find this using Pythagoras’ theorem.