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sudut ABC = 180 - 68 - 75 = 180 - 143 = 37
sudut ADC = sudut ABC = 37 ( karena menghadap busur yg sama)
= 180 - 105
= 75
sudut ABC
= 180 - 68 - 75
= 180 - 143
= 37
Jawabannya C