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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
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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?
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OpenStudy (anonymous):
yes
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