Jawabanmu

2014-05-27T19:57:35+07:00
4x + 20 + x + x + 40 = 180 derajat
6x + 60 = 180 derajat
6x = 180 - 60 derajat
6x = 120 derajat
x   = 120 / 6 derajat
x   = 20 derajat
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P = 4x + 20
   = 4.20 + 20
   = 80 + 20
   = 100 derajat
Q = x
   = 20 derajat
R = x+ 40
  = 20 + 40
   = 60 derajat