KasiSuominen119 KasiSuominen119

05-04-2014
Mathematics

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

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runescapememo8 runescapememo8

05-04-2014

4/9; ratio is still the same
20 charrrrrrrrrrrr

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Fastieh Fastieh

06-04-2014

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

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