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Verified answer
Cari dulu sudut BDCkrn, sudut BDC dan sudut BCD sama (segitiga BDC sama kaki)
maka sudut BDC = (180 - 50)/2
= 130/2
= 65
Jika sudut BDC = 65
sudut ADC= 180 - 65 = 115 derajat