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    Question

    In a triangle, PT is tangent and PAB is secant which

    cuts on a circle at points A & B. If PT= 12 cm, PA= 8 cm then find the legth of AB.
    A 9 cm Correct Answer Incorrect Answer
    B 10 cm Correct Answer Incorrect Answer
    C 20 cm Correct Answer Incorrect Answer
    D 24 cm Correct Answer Incorrect Answer

    Solution

    PT 2 = PA `xx`  PB  122 = 8(8 + AB)  144 = 8(8 + AB)  18 = 8 + AB  AB = 18 - 8 = 10 cm

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