Find the number of sides of a polygon, the sum of whose interior angle is 1620°
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The number of edges (sides) is 'n'
The sum of all the interior angles of any regular polygon = ( n - 2 ) x 180
Therefore , ( n - 2 ) x 180 = 1620
( n - 2 ) = 1620 / 180
( n -2) = 9
n = 9 + 2
n = 11
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