A 5 sided pentagon has 5 vertices
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Pentagonal is an adjective and the answer will depend on pentagonal WHAT! A pentagonal pyramid has 6 vertices whereas a pentagonal regular polyhedron has 20.
A pentagon has 5 vertices. It is one of the few polygons that has an equal number of vertices and sides.
6 vertices.
A pentagonal prism has 10 vertices because there are 5 points on one side and 5 on the other. Note: another word for vertices is corners. A pentagonal prism has ten vertices. 5*2=10 :D 10
a pentgon
A pentagon is a polygon that has 5 sides, 5 vertices and a flat face