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21 September, 14:00

The area of circle b is 25 times greater than the area of circle a. The radius of circle a is 3. What is the radius of circle a of circle b

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  1. 21 September, 15:07
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    Circle a: π*r1^2=π*3^2=π*9. r1=3

    Circle b: π*r2^2

    (π*9) * 25=π*r2^2. (25 Times circle a equals one time circle b)

    9*25=r2^2

    r2=√9*25 = √225=15
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