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Any. You can have a triangular pyramid (tetrahedron), a rectangular one, a pentagonal one, and so on. Similarly, you can have a triangular prism, a rectangular prism, and so on.
If you arrange them in the form of a tetrahedron - a triangular pyramid.
They are both 3d and they both form triangles on the sides to come up and make a point
An octahedron. It could be in the form of a heptagonal pyramid, a hexagonal prism, or a rectangular dipyramid (two rectangular pyramids stuck together along their bases).
Think in 3-dimensions and make a tetrahedron (a triangular pyramid).