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Tangents PA and PB are drawn to a circle with centre O and ∠APB = 80°. Find ∠AOP.

Class 10Tangent Lengths and IncirclesGeometry
  • A50°
  • B40°
  • C80°
  • D100°

Step-by-Step Solution

OP bisects ∠APB, so ∠OPA = 40°. In right triangle OAP (∠OAP = 90°), ∠AOP = 180° − 90° − 40° = 50°.
Answer: A) 50°

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