If the sum of the measures of the interior angles of a regular polygon is 1980. Find the number of sides in the polygon?

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Answer 1 · 2018-06-21T07:13:38

$13$

for a regular polygon, with $n$ number of sides, the sum of interior angles is given by;

$S=(n-2)xx180$

we have

$1980=(n-2)xx180$

$=>n-2=1980/180$

$:.n-2=11$

$n=13$

no of sides is $13$