find the number of side in a polygon if the sum of its interior angle is 3420°
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given sum of the interior angle is 3420 and
we know that
3420=(n-2)x180
3420=180n-180x2
3420=180n-360
3420+360=180n
3780=180n
n=3780/180=21
therefore the number of side is 21
we know that
3420=(n-2)x180
3420=180n-180x2
3420=180n-360
3420+360=180n
3780=180n
n=3780/180=21
therefore the number of side is 21
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