Chapter Test
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Euler's Formula states that the sum of the number of faces and vertices of a polyhedron is two more than the number of its edges.
12
The hexagon contributes with six edges. Moreover, there is another extra edge for each of the six vertices of the hexagon. These are the edges that come together to create the triangles. The number of edges of the polyhedron is the sum of these. 6+6=12 edges