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A point P is 25 cm away from the centre O of a circle and the tangent PT to the circle is 24 cm long. The radius of the circle is
A7 cm
B10 cm
C15 cm
D20 cm
Answer & Solution
Correct answer: A. 7 cm
1. OP squared = OT squared + PT squared.
2. 625 = OT squared + 576, so OT squared = 49.
3. Radius OT = 7 cm.
_Source: NCERT Class 10 Mathematics, Ch 10 "Circles", §10.3_
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