A square pyramid.
A triangular prism, a triangle base and three triangular faces (a tetrahedron)The figures below do not strictly have a "base" but they are composed entirely of trianglesAn octohedron (eight sides)An isocahedron (20 identical equilateral triangular faces, 30 edges and 12 vertices)Any of a number of deformations of the above
It is a triangular prism
Pyramid shaped... like triangular but the bottom has a square base and at the top it meets at a point.
A pyramid. Triangular base and three connected sides equal a pyramid.
A triangular prism can have a square or triangular base.
the base of a triangular pyramid is triangle
the base of a triangular pyramid is triangle
If it is a pyramid, then the base shape is a SQURE. If it is a tetrahedron, then the base shape is a triangle.
Triangular Pyrimid
A triangular prism can have a square or triangular base, but faces are normally triangles. (I think)
That would be a triangular pyramid.
It is a pyramid
It is normally rectangular in shape.
Triangular Pyramid
It is rectangular
Tetrahedron