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Mathematics 22 Online
OpenStudy (anonymous):

What is the sum of the angle measures in a polygon that has 20 sides? Answers: http://gyazo.com/fe3c8f868375e9c4d250fbf9a9f16446

OpenStudy (anonymous):

Sum of the angles within a polygon, where \(n\) is the number of sides: \[ 180(n-2)=a_{total}\deg \]Use that.

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