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A n sided figure has 1/2 n(n - 3) diagonals

→ a 17-gon has 1/2 x 17 x (17 - 3) = 1/2 x 17 x 14 = 119 diagonals

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βˆ™ 10y ago
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Q: How many diagonals does a 17-gon have?
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