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5 votes
If arc AB = 70°, how many degrees are in ∠ ADB?

1 Answer

2 votes
Diameter of the circle is BD as shown, as indicated and passed through center where BD passes, triangle ABD is a right triangle with angle ABD as the right angle. It means ADB and ABD are complementary which meansAB = 140 degreeAD=40 degree
answered
User TaoZang
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