What will be the ratio between the area of two circles if the ratio between the radius of these circles is 1:3? - IQ786

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What will be the ratio between the area of two circles if the ratio between the radius of these circles is 1:3?

What will be the ratio between the area of two circles if the ratio between the radius of these circles is 1:3?

1:3

3:1

1:9

3:9

Explanation