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I need help on 11-13 please i need this done asap! Can someone help me out

I need help on 11-13 please i need this done asap! Can someone help me out-example-1
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User Kbth
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2 Answers

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Learn this the sum of angles in a polygon is (n-2)* 180. n is the number of sides or angles in the polygon.
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User Shaun The Sheep
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13 is 141. A octagon has 1080 degrees and if you add all the angles up you get 939 and 1080-930=141
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User Bhuga
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