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Sudut bad = sudut bcd =60 derajat
Sudut abc = sudut adc
A+B+C+D = 360 DERAJAT
60+B+60+B = 360 DERAJAT
120 +2B = 360 DERAJAT
2B = (360 - 120) DERAJAT
2B = 240 DERAJAT
B = 120 DERAJAT
SUDUT ABC = 120 DERAJAT