54
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number of diagonals in an n-sided polygon is n(n-1)/2 - n If the polygon has 12 sides, number of diagonals is 12(12-1)/2 -12 = (12)(11)/2 -12 = 132/2 - 12 = 66-12 = 54
There are 54 diagonals in a 12 sided shape
A regular 12 sided dodecagon has 54 diagonals.
A 12-sided figure is called a dodecagon.
Well if you have an 8 sided figure there is obviously 8 sides.