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    Question

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    A 50 Cm Correct Answer Incorrect Answer
    B 40 Cm Correct Answer Incorrect Answer
    C 48 Cm Correct Answer Incorrect Answer
    D 30 Cm Correct Answer Incorrect Answer

    Solution

    AC = Length of the direct common tangents BD = Length of direct transverse tangents Let, the distance between two circles = x cm So, BD = √[x2 - (7 + 7)2] β‡’ 48 = √(x2 - 142) β‡’ 482 = x2 - 196Β  [Squaring on both sides] β‡’ 2304 = x2 - 196 β‡’ x2 = 2304 + 196 = 2500 β‡’ x = √2500 = 50 cm Also, AC = √[502 - (7 - 7)2] β‡’ AC = √(2500 - 0) = √2500 = 50 cm ∴ The length of BD is 48 cm, length of AC is 50 cm

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