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Thread: area of a circle sat

  1. #1
    Junior Member
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    Jun 2013
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    area of a circle sat

    The area of a circle is . If the radius of this circle is tripled, what is the new area?

    (A)

    (B)

    (C)

    (D)

    Thanks

  2. #2
    Junior Member
    Join Date
    Jun 2013
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    The area of a circle with radius is given by the following formula


    So, (1)

    If the radius of this circle is tripled i.e. the new area is equal to (2)

    From (1) and (2) we have that the new area is


    Therefore the correct answer is (C).

    Hope these help!!

  3. #3
    Junior Member
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    Jun 2013
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    Thank you kadence!

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