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How many distinct triangles can be formed by selecting three vertices of a regular octagon? (Triangles with different vertices are considered distinct even if they are congruent.)

 Oct 15, 2018
 #1
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EDIT 

 

Like the guest says  8C3    =  56  !!!

 

 

cool cool cool

 Oct 15, 2018
edited by CPhill  Oct 15, 2018
edited by CPhill  Oct 15, 2018
 #2
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But he/she says "by selecting 3 vertices of a regular octagon". So, shouldn't the number of distinct triangles be:

8C3 = 56 ???

 Oct 15, 2018

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