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Mathematics 10 Online
OpenStudy (anonymous):

In which polygon is the sum of the measures of the interior angles 2160°? A. Nonagon B. 12-gon C. Decagon D. 14-gon

OpenStudy (anonymous):

Okay the formula for the sum of interior angles is: 180(n-2)

OpenStudy (anonymous):

we set the formula equal to the sum 2160= 180n - 360

OpenStudy (anonymous):

2520=180n

OpenStudy (anonymous):

14=n

OpenStudy (anonymous):

so it would be D?

OpenStudy (anonymous):

yes

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