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180 = x + 15 + 4x + 15
180 = 5x = 30
180-30 = 5x
150 = 5x
150 : 5 = x
30 = x
tinggal x yg di soal diganti dg 30
sudut C 45
sudut D 135
5x + 30 = 180 = x + 15
x = 180 - 30 = 30 + 15
------------- = 45 derajat
5
x = 30 derajat sudut D = sudut B
= 4X + 15
= 4 x 30 + 15
= 120 + 15
= 135 derajat