These form, together with the pyramid itself, three stacked triangular prisms. A paper tag on the model reads: 236. Another mark reads: R. Tibbott, (/) May 38. George Wentworth, in his textbook Plane ...

The number of edges of a pyramid is twice the number of edges of the base. A triangle-based pyramid has six edges, 3 × 2 = 6. A square-based pyramid has eight edges, 4 × 2 = 8.

The unpainted wooden model of the frustum of a triangular pyramid has three trapezoidal sides and a triangular top and base. It is dissected into three pieces. A paper label attached to one side reads ...