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9. In the figure, if angle ABC = 60°, thenangle AOC =(A) 120° (B) 60° (C) 30° (D) 90°А060B​

Answer»

Answer:

Step-by-step explanation:

We KNOW that the angle at the CENTRE of the circle is twice the angle at the circumference SUBTENDED by the same arc.

Thus,

  ∠AOC=2×∠ABC

⟹∠AOC=2×20  

⟹∠AOC=40  



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