In the following figure, if PC = 6, CD = 9, PA = 5 and AB = x, find the value of x?
Explanation:
When two secants are drawn from an external point to a circle
⇒ PC × PD = PA × PB
∴ 6 × 15 = 5 × (5 + AB)
⇒ AB = 13
Hence, 13.
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