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Question
In two concentric circles, a chord of length 16 cm of larger circle becomes a tangent to the smaller circle whose radius is 6 cm. Find the radius of the larger circle
Solution
Here AP = PB = 8 cm
In ∆OPA,
OA2 = OP2 + AP2 
= 62 + 82
= 36 + 64
= 100
OA = `sqrt(100)` = 10 cm
Radius of the larger circle = 10 cm
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