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How many diagonals does a convex 12-gon have?

 Apr 29, 2021
 #1
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there is 54 :)

 Apr 29, 2021
 #2
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12*11/2 = 66 total diagonals

but 12 are sides, 66-12

 

=^._.^=

 Apr 29, 2021

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