Tetrahedron
It is a tetrahedron pyramid
4 of the faces of a Rectangular Pyramide are triangles.
A tetrahedron
pyramid
Tetrahedron
4 faces are triangles and 1 face is a square the square face is the base of the pyramid
A triangle based pyramid.
It is a tetrahedron pyramid
4 of the faces of a Rectangular Pyramide are triangles.
No because it has a square base and 4 triangular faces
A tetrahedron
Tetrahedron
pyramid
sorry but all i can find is 4 faces 6 edges and 4vertices's :(
a triangular pyramid
There is a contradiction in your question. If the base has four equal sides then is it a square so not all the faces are Triangles. However if the base is a square and the rest of the faces are triangles then your object is a "Square-based Pyramid"