Posted by Kay Kay on .
a polyhedron has 36 edges and 21 faces, how many vertices does it have?
thank you

math 
MathMate,
You can use Euler's polyhedral formula:
V+FE = 2
V=number of vertices
F=number of faces
E=number of edges
Substitute
E=36 and F=21 into the polyhedral formula and solve for V.