Diagonals connect corners of a figure. If you try to connect two corners of a three sided figure, the lines you draw will exactly mimic the sides of the figure. Because of this, a three sided figure has no diagonals.
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153 diagonals.
A polygon with 14 diagonals will have 7 sides
There are: 0.5*(682-(3*68)) = 2210 diagonals
An octagon has 8 sides and 20 diagonals so the question doesn't make sense
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