From an external point , two tangents and are drawn to a circle with center . If , find .

Answer and explanation

Correct answer: B.

  1. Step 1: The radii and , so .
  2. Step 2: In quadrilateral , the sum of angles is .
  3. Step 3: .
  4. Step 4: .
Answer
.
Why not the others: assumes right angle; equates central angle to tangent angle; and subtracts 70.

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From an external point P, two tangents PA… | CBSE Class 10