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4x = 180-60
4x = 120
x = 120/4
x = 30
a = 30
b = 3x = 3 X 30 = 90
x + 3x + 60 = 180
4x = 180-60
4x = 120
x = 120/4
x = 30
maka nilai
sudut a = 30
sudut b = 3 . 30 = 90
susut c = 60