In the given figure A, B and C are three points on a circle with centre O such that ∠BOC=30∘ and ∠AOB=60∘. If D is a point on the circle other than the arc ABC, find ∠ADC.
[ 2 marks ]
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Solution
It can be observed that,
∠AOC=∠AOB+∠BOC∠AOC=60∘+30∘=90∘
(1 Mark)
We know that angle subtended by an arc at the centre is double the angle subtended by it any point on the remaining part of the circle.