# Square Pyramid # Rectangular Pyramid # Triangular Pyramid
A pyramid with a square base.
Tetrahedron
A square based pyramid.
It could be a pyramid.
# Square Pyramid # Rectangular Pyramid # Triangular Pyramid
A pyramid with a square base.
Tetrahedron
Because the base of a cone is round, it is the only three dimensional figure with only one vertex.
A square based pyramid.
pyramid or cone
It could be a pyramid.
A square based pyramid would comply with the given dimensions.
It can be a triangular based pyramid
It is simply called a face.
A hemisphere is one example.
Cone