plz answer it fast plzz
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∠ACD=50 (ANGLES IN LINEAR PAIR)
∠DAC=∠ACD=50° (OPPOSITE ANGLES OF EQUAL SIDES)
∠ADC=80° (REMAINING ANGLE)
∠ADB=100° (ANGLES IN LINEAR PAIR)
∠BAD=∠ABC=40° (OPPOSITE ANGLES OF EQUAL SIDES)
∠BAC=∠BAD+∠CAD (ANGLE ADDITION PROPERTY)
=40°+50°
∠BAC=90°