From an external point , two tangents and are drawn to a circle with center . If , find .
Answer and explanation
Correct answer: B.
- Step 1: The radii and , so .
- Step 2: In quadrilateral , the sum of angles is .
- Step 3: .
- Step 4: .
Answer
.
Why not the others: assumes right angle; equates central angle to tangent angle; and subtracts 70.
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