The ratio of the radii of two circles is 4:9. What is the ratio of their circumferences?

asked Mar 8, 2015 82.1k views

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3 votes

4/9; ratio is still the same
20 charrrrrrrrrrrr

Krishna Vyas answered Mar 11, 2015

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It will be 4:9 as well.
Circumference = 2πr,
r1 : r2 = 4:9 so this means that 2πr1 : 2πr2 = 4:9, because 2π = constant

Ahmad Behzadi answered Mar 15, 2015

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