Question
R is a point outside a circle and is 18 cm away from its centre. A secant drawn from the point R intersects the circle at points A and B in such a way that RA = 7 cm and AB = 5 cm. The radius of the circle (in cm) is:
The correct answer is
4√15
Using the power of a point theorem, solving for the radius gives 4√15 cm.
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