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Question

The sum of the interior angles of a polygon is 1620. The number of sides of the polygon are:

A
9
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B
11
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C
15
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D
12
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Solution

The correct option is B 11
The sum of the interior angles of a polygon of n sides is given by the expression (2n4)π2(2n4)×π2=1620×π180(2n4)=1620×2180=18.
or 2n = 22
or n = 11

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