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Sudut BAD
180 – 70 = 110 : 2 = 55°

sudut ABD
180 – 50 = 130 : 2 = 65°

sudut ADB
= BAD + ABD + ADB = 180°
= 55° + 65° + ADB = 180°
= 120° + ADB = 180°
= ADB = 180° – 120°
= ADB = 120°