Question

If ADB = 70°,

then ABD =_____  degrees

m∠ AB = ______ degrees

m∠ AD = ______ degrees

Answer 1

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 means
AB = 140 degree
AD=40 degree