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