Circle O is shown. Line segments AC and BD are diameters. The measure of arc AB is (3x minus 70) degrees and the measure of arc DC is (x + 10) degrees. What is mArc BC?

Circle O is shown. Line segments AC and BD are diameters. The measure

1.	Circle O is shown. Line segments AC and BD are diameters. The measure of arc AB is (3x minus 70) degrees and the measure of arc DC is (x + 10) degrees. What is mArc BC?
Answer» Circle O is shown. Line segments AC and BD are diameters. The measure of arc AB is (3x minus 70) degrees and the measure of arc DC is (x + 10) degrees. What is mArc BC?