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Question

If the sum of interior angles of a polygon is 1620, then the polygon has ___ sides.



A

11

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B

12

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C

15

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D

18

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Solution

The correct option is B

11


Sum of interior angles of a polygon with n sides

=(2n4)×90

    (2n4)×90=1620

2n - 4 = 18

2n = 22

n = 11

And (A)


Mathematics

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