pyramid
A pyramid
It is a tetrahedron
A pyramid could be constructed from 4 or more triangles.
A triangular pyramid has four faces, and is referred to as a tetrahedron if the faces ale all equilateral triangles.
A square based pyramid.
a pyramid
pyramid
One square and four triangles.
Triangles (four of) and a square.One square as base and four triangles as sides.
Pyramid
Four of them
A pyramid
It has four triangles and a square.
Square Pyramid
A square pyramid has.
It is a tetrahedron