Engineering Board Exam Reviewer · Circles: Chords, Tangents and Secants · medium
From an external point P, a secant meets a circle at A and B with PA=4 and PB=16 (measured from P to each intersection). Find the length of the tangent from P.
- 10
- 12
- 6.93
- 8
Answer
D. 8
Solution
Tangent-secant theorem: t2=PA· PB=4(16)=64 t=8.
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