mckennahitt17 mckennahitt17

10-12-2017
Mathematics

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

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

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tynollette tynollette

10-12-2017

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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