Q4 of 141 Page 447

In the given figure, O is the centre of a circle and ∠ACB = 30°. Then, ∠AOB = ?

Given:


We know that


2 × ACB = AOB (The angle subtended by an arc at the center is twice the angle subtended by the same arc on any point on the remaining part of the circle).


2 × 30 = AOB


AOB = 60.


AOB = 60

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