Does a triangular based pyramid have perpendicular edges?

Answer 1

In a triangular-based pyramid, also known as a tetrahedron, the edges connecting the apex to the base vertices are not necessarily perpendicular to the base edges. However, the edges of the triangular base itself are not perpendicular to each other unless the triangle is a right triangle. Therefore, while some configurations may have perpendicular edges, it is not a general characteristic of all triangular-based pyramids.