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    Question

    If the radius of a circle is given up to 15 times, how

    much of its perimeter will be the perimeter of the previous perimeter?
    A 20 Correct Answer Incorrect Answer
    B 15 Correct Answer Incorrect Answer
    C 21 Correct Answer Incorrect Answer
    D 18 Correct Answer Incorrect Answer

    Solution

    Let radius of the circle be r cm. Circumference of the circle = 2 πr New radius of the circle = 15 r New circumference of the circle = 2 π × 15r = 30 πr Required answer = 30 πr/2 πr = 15 (times)

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