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

The ratio of the radii of two circles is 4:9. What is the ratio of their circumferences?
asked 82.1k views
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The ratio of the radii of two circles is 4:9. What is the ratio of their circumferences?

asked
User Bhargav Sejpal
by
8.2k points

2 Answers

3 votes
4/9; ratio is still the same
20 charrrrrrrrrrrr
answered
User Krishna Vyas
by
8.5k points
2 votes

It will be 4:9 as well.
Circumference = 2πr,
r1 : r2 = 4:9 so this means that 2πr1 : 2πr2 = 4:9, because 2π = constant
answered
User Ahmad Behzadi
by
8.4k points
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