Sum of measures of angles of a Nonagon is $1260^{o}$ . Find how much each angle is measured.

100^{o}

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140^{o}

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108^{o}

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90^{o}

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Solution

The correct option is A $140^{o}$
Each angle $= \frac{(n - 2) \times 180^{o}}{n}$
$= \frac{(9 - 2) \times 180^{o}}{9}$
$= \frac{7 \times 180^{o}}{9} = 140^{o}$
Therefore, B is the correct answer.

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