there is 13 edges in a heptagonal pyramid.
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Well honey, a heptagonal pyramid has 7 vertices because it's a heptagon at the base, and it has 10 edges because each vertex is connected to the apex. So, there you have it, 7 vertices and 10 edges in that sassy heptagonal pyramid.
hexagonal pyramid
There is no 3d shape made up of octagons. An octahedron can be one of several different shapes - but without ANY octagonal faces. For example, A hexagonal pyramid (8 faces, 18 edges, 12 vertices) A heptagonal pyramid (8 faces, 14 edges, 8 vertices) A quadrilateral dipyramid (8 faces, 12 edges, 6 vertices)
a rectangular pyramid has a total of 8 edges
There are 7 or 9, depending on the bases.