A pyramid is made up of a polygonal base face and triangular faces that meet at a point called the apex. A pyramid is named by the shape of its ‘base’.

The most common pyramids are square-based, rectangular-based and triangular-based pyramids. The surface area of a pyramid can be calculated by adding the area of the base to the sum of the areas ...

Each has three plastic transparent sides and a white plastic triangular base. The four models can be joined to form a square pyramid with white sides and a transparent base.