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

 

 Nov 18, 2019
 #1
avatar+2551 
+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????

 Nov 18, 2019
 #2
avatar+106943 
+1

I cannot see a problem with your logic CU.

 

It would be good if some other knowledgable person also voiced their agreement though.

Melody  Nov 18, 2019

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