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BAC : BAD
2x :5x
sehingga sudut CAD = 3x
nilai x
2x + 3x = 105
5x= 105
x = 21
sudut CAD dan ACD
3x
= 3(21)
=63derajat
CAD + ACD + ADC = 180
63+ 63+ ADC =180
126 +ADC=180
ADC = 54 derajat