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OpenStudy (anonymous):
The radii of two circles are 3 cm and 9 cm. Find the ratio of their circumferences.
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OpenStudy (anonymous):
1/3
jhonyy9 (jhonyy9):
do you know the formula of circumference of circle ?
OpenStudy (anonymous):
circumference=2*pi*r;
OpenStudy (anonymous):
so the ratio of circumferences is the ratio of the radii.
jhonyy9 (jhonyy9):
yes ,right
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OpenStudy (anonymous):
ratio of circumferences = r1 : r2
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