A tetrahedron or triangular pyramid
the base of a triangular pyramid is triangle
the base of a triangular pyramid is triangle
It can be a pyramid shape with an equilateral triangle base
a pentagonal pyramid is a shape with a base of a triangle, and triangles forming up to the point
A square based pyramid.
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A shape with a square base and four triangular sides is a pyramid.
If the base of the pyramid is a triangle then all its faces would be triangular in shape.
A triangular prism is so called because the shape of the ends is a triangle. A triangular pyramid is so called because the shape of the base is a triangle.
Pyramid with a hexagonal base
A pyramid but it can have a base that is different and also a triangle
a square pyramid