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9x + 72 = 180
9x = 108
x = 12
sudut CAD + CAB =180
CAD = 180 - CAB
CAD = 180 - 4X
CAD = 180 - 48
CAD = 132 DERAJAT
180 = 9x + 72
9x = 180-72
9x = 108
x = 108/9
x = 12
maka besar CAD adalah
180 - (4x)
180 - ( 4 x 12)
180 - 48
= 132 derajat (c)