Find the number of sides of a regular polygon if the sum of its interior angle is 1620°.
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let the number be n
then according to formula
(n-2)*180°=1620°
(n-2)=1620/180
(n-2)=9
n=9+2
n=11
then according to formula
(n-2)*180°=1620°
(n-2)=1620/180
(n-2)=9
n=9+2
n=11
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