3 years ago

MAB = 120 and AC is the diameter of this circle. What is the degree measure of BDC

1 answer:

7 0

MAB is 120, so m∠ADB is half of mAB=60
AC is the diameter, which means arc ABC is 180, and m∠ADC=90
m∠BDC=m∠ADC-m∠ADB=90-60=30
so the angle BDC is 30 degree

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