Engineering Board Exam Reviewer · Circles: Chords, Tangents and Secants · medium
A tangent segment from an external point to a circle measures 15 cm, and the distance from the external point to the center is 17 cm. Find the radius of the circle.
- 8 cm
- 9 cm
- 6 cm
- 10 cm
Answer
A. 8 cm
Solution
The tangent is perpendicular to the radius at the point of tangency: r2+152=172 r2=64 r=8 cm.
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