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    Question

    Two circles touch each other externally as shown in the

    figure above. The radius of the circle with centre O is 49 cm. The radius of the circle with centre A is 16 cm. Find the length (in cm) of their common tangent BC. 
    A 56 Correct Answer Incorrect Answer
    B 55 Correct Answer Incorrect Answer
    C 58 Correct Answer Incorrect Answer
    D 57 Correct Answer Incorrect Answer

    Solution

    ATQ, R = 49, r = 16, d = R + r = 65

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