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The ratio of the radius of two circles is 1: 3, and then the ratio of their areas is?

1:3
1:6
1:9
1:5
Explanation:

$r_{1}r_{2}$ = 1 : 3

$ \pi r_{1}^2$ :$ \pi r_{2}^2$

$r_{1}^2 $:$ r_{2}^2 $= 1:9

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