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AOB = sdt pusat
2ACB =AOB
2ACB + 3 AOB = 256
AOB + 3 AOB = 256
4AOB = 256
AOB = 256/4 = 64
AOD = 180 - AOB = 180 -64 = 116
ACD = 1/2. AOD = 1/2. 116 = 58 (C)