Question

If O is the centre of the circle and ∠ ABC=30° then find ∠AOC.

• A. ${45}^0$
• B. ${30}^0$
• C. ${60}^0$
• D. ${90}^0$

Answer 1

The correct option is C ${60}^0$

Given ∠ABC=30°
∠AOC= 2∠ABC (Th e angle subtended by an arc at the centre is double the angle at any point on the circle)
∠AOC = 2×30° = 60°