A pyramid can only have an even number of edges.
A bilateral polygonal solid that does have 13 edges is a heptahedron having 4 triangular sides and two rectangular sides, the edge between the rectangles forming the 13th edge.
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there is 13 edges in a heptagonal pyramid.
13 vertices. A pyramid always has the same number of faces and vertices.
There are actually more than a pyramid that have that number of edges. Pentagonal star pyramid has 20 edges. Decagonal pyramid is another one.
An octagonal pyramid has 9 faces and 14 edges. The base of the pyramid is an octagon with 8 faces, and the pyramid itself has an additional triangular face. The edges consist of the edges of the octagon base and the edges connecting the base to the apex of the pyramid.
a rectangular pyramid has a total of 8 edges