The Pentagonal Rotunda has 20 vertices, 17 faces and 35 edges. The Pentagonal Rotunda contains 10 trangles, 6 pentagons and 1 decagon.
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A pentagonal rotunda have 20 vertices
10 sides.
There is no formula for how many sides there are in a polygon; the name of the polygon shows how many sides it has.
A pyramid with an n-sided base will have n + 1 vertices, n + 1 faces, and 2n edges. 6 faces, 10 edges, 6 vertices
heptagons have 7 sides