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by using formula, n(n-3)/2
an octagon has 8(8−3)/2 = 8×5/2 = 20 diagonals.
That is what i can do for you in 2 minutes.
an octagon has 8(8−3)/2 = 8×5/2 = 20 diagonals.
That is what i can do for you in 2 minutes.
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