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

User Richard Pursehouse
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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
User TaoZang
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