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    Question

    If the radius of a circle becomes ten times, how much of

    its periphery will be its circumference?
    A 9 Correct Answer Incorrect Answer
    B 8 Correct Answer Incorrect Answer
    C 11 Correct Answer Incorrect Answer
    D 10 Correct Answer Incorrect Answer

    Solution

    Let the radius of the circle be r cm. Circumference of the circle = 2πr The new radius of the circle = 10r New circumference of the circle = 2 π × 10r = 20πr   Required answer = 20πr/2πr = 10 (times)

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