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7/3 ABO + ABO + 90 = 180
10 / 3 ABO = 90
Sudut ABO = 90 x 3 / 10
= 27°
3. Sudut AOB = x + 22
Sudut ABO = 2x - 7
Sudut BAO = 90
x + 22 + 2x - 7 + 90 = 180
3x + 105 = 180
3x = 75
x = 25