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Use Theorem to solve the prob­lem. According to this theorem, the number of diagonals in a...

Use Theorem to solve the prob­lem. According to this theorem, the number of diagonals in a polygon of n sides is given by  

The total number of diagonals D in a polygon of n sides is given by the formula.

Find the number of sides in a polygon that has 9 diagonals.

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Solutions For Problems in Chapter A.4
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