Geometry/Steve

A circle has an area of approx. 78.5 square units. If the center of the circle is at (2,4). Which of the following points is on the circle?

A. (-6,4)
B. (2,-1)
C. (-4,-4)
D.(2,-9) ********

My thoughts are D - can you please check it...thanks

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  1. 78.5 = 25π, so r=5
    (2-2)^2 + (-9-4)^2 = 13^2, so D is wrong

    (A) (-6-2)^2 + (4-4)^2 = 64, so nope
    (B) (2-2)^2 + (-1-4)^2 = 25 we have a winner
    you can check (C) if you want.

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  2. okay I understand now...thank you

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  3. the answer is actually b, (2,-1)

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