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(Please help with this question, and do your best to explain.)

(Please help with this question, and do your best to explain.)-example-1

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Formula: Sum=180(n - 2) \: (with \: n \: is \: the \: number \: of \: sides) \\ \Rightarrow Heptagon:180(7 - 2) = 180 * 5 = 900°

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