Four triangles (one on the bottom and the 3 sides).
A triangular pyramid has four triangular faces.
Square Pyramid has a square base and 4 triangular sides. Triangular Pyramid has a triangle base and 3 triangular sides.
a triangular pyramid
triangular pyramid
Just one: a tetrahedron or triangular pyramid.
triangular pyramid
A square pyramid has a square base and four congruent triangular faces.
PYRAMID
triangular prism pentagonal pyramid
octogons
Pyramids
4 triangles and 1 square.