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A and B are points on a circle with centre O, and ∠OAB = 28°. C is a point on the minor arc AB. Find ∠ACB.

Competition practiceGeometry
  • A118°
  • B62°
  • C124°
  • D56°

Step-by-Step Solution

OA = OB, so ∠OBA = 28° and ∠AOB = . A point on the major arc sees AB at 62°; C is on the minor arc, so ∠ACB = .
Answer: A) 118°

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