leslie66 leslie66
  • 25-04-2017
  • Mathematics
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Please help. Don't know what to do. (Geometry)

Please help Dont know what to do Geometry class=

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mohabbasem
mohabbasem mohabbasem
  • 25-04-2017
(360/10)/2 = 18°

Cos(18)=a/r=a/5 ---> a=4.8

Tan(18)=o/a=o/4,8 ---> o=1.6

Area = 1/2 * 4.8 * 1.6 * 20 = 76.8 

The right answer is A, i have just rounded up, so i didn't get is precise. 
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