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Anonymous
1/2*36*(36-3) = 594 diagonals.
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1/2*(362-3*36) = 594 diagonals
It is: 0.5*(144-36) = 54 diagonals
We just call it a 36-gon
It is a dodecagon which has 12 sides Check: 0.5*(144-36) = 54 diagonals
36 degrees