Find the number of sides of a polygon, if the sum of its interior angle is 1260 degrees.
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The sum of interior angles of a regular polygon is (n - 2)×180.
Given sum of interior angles = 1260
(n - 2)×180 = 1260
n - 2 = 7
n = 9
Therefore the number of sides = 9.
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9 is the right answer. make helpful to you
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