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14 votes
14 votes
Solve the polygon for x

Solve the polygon for x-example-1
User Colin Smith
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1 Answer

17 votes
17 votes
  • Octagon has sum of angles 1080°


\\ \rm\Rrightarrow 5(10x+15)+2(14x)+6x-3=1080


\\ \rm\Rrightarrow 50x+75+28x+6x-3=1080


\\ \rm\Rrightarrow 84x+72=1080


\\ \rm\Rrightarrow 84x=1008


\\ \rm\Rrightarrow x=1008/84


\\ \rm\Rrightarrow x= 12

User Sergio Tanaka
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