Q14 of 63 Page 156

In figure, if ∠ABC = 20°, the ∠AOC is equal to—

Given ∠ABC = 20°


We know that angle subtended at the centre by an arc is twice the angle subtended by it at the remaining part of the circle.


⇒∠AOC = 2 ∠ABC


⇒∠AOC = 2 (20°)


∴ ∠AOC = 40°

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