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10 April, 19:26

The sum of interior angles of a regular polygon is 1980 degrees. How many sides does the polygon have?

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  1. 10 April, 22:39
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    The formula for interior angle sum is 180 (n - 2).

    Backtrack it from that.

    180 (n - 2) = 1980.

    1980 / 180 = 11 = n - 2.

    11 + 2 = 13 = n.

    The polygon has 13 sides.
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