Question

In the hiven figure , o is the centre of the circle and AB is a chord of the circle. If angle AOB=70° , find angle ACB

Answer 1

Given ang. AOB= 70°
Therefore ang. ACB= 70/2
(angle substended at the center is double the angle substended at any point on the circle)

Therefore ang. ACB= 35°

Answer 2

Answer:

Given: AB, CD are equal chords

=> <ADB = 70

To Find: OCD

= <AOB= 70

= <OCD= 70 (Angle subtended by an arc at the centre of circle is twice the angle subtended by it at other point on the circle)

= <OCD = 70/2

             = 55