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Verified answer
L AOB = L COD = 70° ( sudut bertolak belakang sama besar )L OCD = L ODC ( karena segitiga sama kaki)
misal sudut ACD = x, maka
2x + L COD = 180
2x = 180 - 70
2x = 110
x = 55°
Jadi L ACD = 55°