5. 4 on the bottom and 1 on top at the peak
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So not true!
A pyramid is a generic term used to describe a polyhedron with a polygonal base and a number of triangles rising from that base to meet at an apex. A pyramid whose base is a polygon with n-sides (or vertices) has n+1 faces, n+1 vertices and 2n edges, where n ≥ 3.
So, a triangular pyramid, or tetrahedron, has 6 edges.
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A three dimensional triangle is also known as a pyramid. In a triagonal pyramid, there are six edges and four corners.
A triangular-based pyramid has 4 corners, 4 faces and 6 edges.
It has 4 corners.
You have the triangle on the bottom and the three faces on the sides, which means there are 4 faces and 6 edges.
A triangular base pyramid which is a tetrahedron has 4 faces, 6 edges and 4 vertices