Question #4927a

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Question #4927a

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Answer 1 · 2017-10-13T00:20:43

$81 : 1$ $81:1$

Explanation:

Ratio of radii $r 1 : r 2 = 9 : 1$ $r1:r2=9:1$
Ratio of areas $π r_{1}^{2} : π r_{2}^{2}$ $pir_1^2:pir_2^2$ $or r_{1}^{2} : r_{2}^{2} = 9^{2} : 1^{2} = 81 : 1$ $or r_1^2:r_2^2=9^2:1^2=81:1$

Answer 2 · 2017-10-17T10:15:25

$81 : 1$ $81:1$

Explanation:

In general

$ratio of areas : : {(ratio of lengths)}^{2}$ $"ratio of areas"::"(ratio of lengths)"^2$

in this case

$ratio of lengths : : 9 : 1$ $"ratio of lengths"::9:1$

$:."ratio of areas"::(9:1)^2::81:1$

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Question #4927a

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