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    Question

    In a regular polygon, each interior angle is 9 times its

    exterior angle. The number of sides of the polygon is:
    A 16 Correct Answer Incorrect Answer
    B 33 Correct Answer Incorrect Answer
    C 17 Correct Answer Incorrect Answer
    D 20 Correct Answer Incorrect Answer

    Solution

    Let exterior angle = x Then interior angle = 9x We know: Interior angle + exterior angle = 180 9x + x = 180 10x = 180 x = 18 Number of sides = 360/18 = 20

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