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(3B) - B = 70
2b = 70 maka B = 35
A = 3B
Maka A = 3.35 = 105 ;)
Sudut a + sudut b = 105 + 35 = 140
Pelurus sudut a --> a + b = 180 derajat
105 + b = 180
Maka b (pelurus sudut a) = 180 - 105 = 75 derajat ;)