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KVPY2015MathematicsProperties of Triangles

Let P be an interior point of a triangle ABC . Let Q and R be the reflections of P in AB and AC , respectively. IF Q , A , R are collinear then A equals.

Options

  1. A30^
  2. B60^
  3. C90^
  4. D120^

Correct answer

C. 90^

Step-by-step solution

So from Diagram array l + + + =180^ A = + =90^ array

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