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प्रश्न
Find the number of side of a regular polygon, when of its angle has a measure of 162° .
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उत्तर
\[ \text{ Each interior angle } = \left( \frac{2n - 4}{n} \times 90 \right)^° \]
\[So, \left( \frac{2n - 4}{n} \times 90 \right)^° = 162° \]
\[ \Rightarrow \frac{2n - 4}{n} = \frac{162° }{90° }\]
\[ \Rightarrow \frac{2n - 4}{n} = \frac{9}{5}\]
\[ \Rightarrow 10n - 20 = 9n\]
\[ \therefore n = 20\]
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