Geometrymedium · Past Paper
The length of a tangent from a point P at distance 13 cm from the center of a circle is 12 cm. What is the radius?
A5 cm
B7 cm
C10 cm
D25 cm
✓ Correct Answer: A — 5 cm
r^2 = distance^2 - tangent^2 = 13^2 - 12^2 = 169 - 144 = 25. r = 5 cm.
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