29-12-2016
Mathematics

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Two circles have areas of 16 pi and 25 pi . Find the ratio of their circumferences

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30-12-2016

c=2pir
a=pir^2

16pi=pir^2
16=r^2
4=r

c=2pir
c=2pi4
c=8pi

25pi=pir^2
25=r^2
5=r

c=2pir
c=2pi5
c=10pi

8pi vs 10pi
ratio is 8pi:10pi=4pi:5pi=4:5

ratio is 4:5

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