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In a triangular based pyramid, the three faces that form the base are perpendicular to the apex of the pyramid, which means they have pairs of perpendicular sides. The other three faces, which are triangular, do not have pairs of perpendicular sides.
a triangular based pyramid has 4 faces.
No, it has five plus the bottom :D * * * * * The previous answer is incorrect: a pyramid with 5 faces plus the bottom would be a pentagon based pyramid! A triangular based pyramid, or tetrahedron, DOES have 4 triangular faces.
A triangular based prisim has four faces.
A triangular based pyramid has 4 faces, 6 edges and 4 vertices
Triangular based pyramid