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24 January, 09:10

What is the radius of the circle whose area is numerically 5 times greater than its circumference?

A) 5

B) 10

C) 4 pi

D) 2 pi

E) pi

The answer is 10, why?

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Answers (1)
  1. 24 January, 10:12
    0
    Pi*r^2 = 5 (2*pi*r)

    pi*r^2 = 10*Pi*r

    divide the equation by pi

    r^2=10*r

    divide the equation by R

    r = 10
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