Question

In the given figure, O is the centre of a circle and OAB = 50°. Then, CDA = ? A 50% B (a) 45° (c) 75° D (b) (d) 50° 25°​

Answer 1

Step-by-step explanation:

AO and OB are radii of the circle.

side AO=BO so, ∠OAB=∠OBA [Isosceles triangle AOB]

Angle subtended by chord at the centre of a circle is double of the angle subtended at it's circumference.

Therefore ∠AOB=2∠ACB

∠AOB=100°

Answer 2

Answer:

Option A is the correct answer.

<OAB=<CDA.(Alternative interior angle).