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In the diagram, KS is a tangent to the circle centre O at R and ∠ROQ = 80o. Find ...



In the diagram, KS is a tangent to the circle centre O at R and ∠ROQ = 80o. Find ∠QRS.
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  • A 90o
  • B 80o
  • C 50o
  • D 40o
Correct Answer: Option C
Explanation:
∠QRS = ∠RPQ (theorem: angle in the alternate segment are equal)
∠RPQ = 50o
∠QRS = 50o

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