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    Question

    The numerical value of the area of a circular park is ten

    times the numerical value of its perimeter. Find the diameter of the park.
    A 28 units Correct Answer Incorrect Answer
    B 40 units Correct Answer Incorrect Answer
    C 36 units Correct Answer Incorrect Answer
    D 21 units Correct Answer Incorrect Answer

    Solution

    ATQ,

    Perimeter (circumference) = 2 ├Ч ╧А ├Ч r

    Area = ╧А ├Ч r┬▓

    Let radius = r units

    ╧А ├Ч r┬▓ = 10 ├Ч 2 ├Ч ╧А ├Ч r

    тЗТ r┬▓ = 20r

    тЗТ r = 20

    Diameter = 2 ├Ч 20 = 40 units

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