tetrahedron
A triangular pyramid.
tetrahedron, a triangular pyramid
A di-tetrahedron.
A triangular dipyramid.A triangular dipyramid.A triangular dipyramid.A triangular dipyramid.
Tetrahedron
A triangular dipyramid.
A triangular pyramid.
Pyramid
tetrahedron, a triangular pyramid
A di-tetrahedron.
A triangular dipyramid.A triangular dipyramid.A triangular dipyramid.A triangular dipyramid.
Tetrahedron
the answer is tetrahedron
A pyramid.
a triangular pyramid
a triangular based pyramid
rectangular pyramid