A diagonal of a polyhedron is a line segment connecting two non-adajcent vertices. How many diagaonals does a pentagonal prism have?

Guest Nov 18, 2019

#1**+2 **

This might be wrong

Each vertice can connect to 6 points.

There are 5 * 2 = 10 vertices in the diagram.

so 6 * 10 = 60.

We overcounted each twice.

so

60 / 2 = **30**????

CalculatorUser Nov 18, 2019