Find the number of sides in a polygon if the sum of its interior angles is $900^{\circ}$ .

7

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9

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5

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6

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Solution

The correct option is A $7$
If the sum of its interior angles is $900^{o}$
Sum of interior angles of a polygon = $180^{o} (n - 2)$
=> $180^{o} (n - 2) = 900^{o}$
=> $(n - 2) = 5$
=> $n = 7$
Number of sides in polygon $= 7$

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