how many sides does a regular polygon have if each of its interior angle is 140°
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as formula for each interior angle of regular polygon is ( 2n-4)*90/n { where n is no of sides}
140= ( 2n-4)*90/n
140 n=180 n-360
360=180 n-140 n;
360=40n
n= 9 ( nonagon )
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