12
4 For a pyramid with a triangle base- 4 vertices (plural of vertex) For a pyramid with a square base- 5 vertices
a triangle has three diagonals as well as three sides
With a triangle base there are four sides including the base
0 they have no diagonals
four sides and a base
A tetrahedron, a triangle based pyramid, an octahedron, an icosahedron plus many more.
Triangles have 0 diagonals.
A triangle has no diagonals
None
A square pyramid has 1 square base and 4 triangle-shaped sides.
Square Pyramid has a square base and 4 triangular sides. Triangular Pyramid has a triangle base and 3 triangular sides.
A pyramid has a variable number of triangular faces. The base of a triangle can be practically any regular shape, starting with a triangle. Technically a pyramid can have four or more triangles as faces.