Question

In the adjoining figure who is the centre of circle AOC is a diameter and AOB=70, ACB will be

Answer 1

AS AO= OB

SO IT BECOMES ISOSCELES

therefore OAB = OBA

OAB + OBA + AOB = 180

2 OBA + 70 = 180

OBA = 55

AOC = 180- 70 = 110

AS AOC is isosceles

2 OAC+ 110 = 180

OAC = 35