Jawabanmu

2014-05-29T13:35:07+07:00
= 4x + 5x + 4x + 5x = 360 derajat
= 18 x = 360 derajat
= x = 360 derajat : 18
= x = 20 derajat
<c = 4x
     = 4 . 20 derajat = 80 derajat
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