How many sides does a polygon have if the sum of its interior angles is 1,260º? A. 7 B. 8 C. 9 D. 10

asked Dec 8, 2017 115k views

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How many sides does a polygon have if the sum of its interior angles is 1,260º?

A. 7
B. 8
C. 9
D. 10

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the sum of interior angle is = 180(n-2) where n denotes the number of sides
so 1260° =180(n-2), n -2= 1,280/180=7, so n=7+2=9
the answer is C. 9

Magmatic answered Dec 12, 2017

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