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OpenStudy (anonymous):
Find the sum of the measures of the interior angles of a convex 20-gon.
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OpenStudy (anonymous):
Sum = (n-2)*180
OpenStudy (anonymous):
\[Sum = (n-2) \times 180 = 18 \times 180 = 3240\]
OpenStudy (anonymous):
n is 20 here..
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