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Ratio of circumference is π : 4π = 1 : 4

This is the ratio of all lengths, therefore their radii are in the ratio of 1:4 also.

Ratio of areas is the square of the ratio of length

→ ratio of their areas is 1² : 4² = 1 : 16

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What is the ratio of the circumferences of two wheels if the ratio of their radii is 2 to 3?

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