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X = 90 - 26 = 64
DCA = ACD
BCD = BCA + DCA = 64 + 52 = 116
<BCA=<BOC-<CBD
X=90-26
X=64
mencari<BCD
<BCD=<BCA+<DCA
Y=64+52
Y=116 derajat
<DAC=<ACD