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प्रश्न
Find the number of side of a regular polygon, when of its angle has a measure of 150° .
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उत्तर
\[ \text{ Each interior angle } = \left( \frac{2n - 4}{n} \times 90 \right)^° \]
\[So, \left( \frac{2n - 4}{n} \times 90 \right)^° = 150° \]
\[ \Rightarrow \frac{2n - 4}{n} = \frac{150° }{90° }\]
\[ \Rightarrow \frac{2n - 4}{n} = \frac{5}{3}\]
\[ \Rightarrow 6n - 12 = 5n\]
\[ \therefore n = 12\]
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