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Byju's Answer
Standard IX
Mathematics
Circle
The ratio of ...
Question
The ratio of the radii of two circles is 3 : 2. What is the ratio of their circumference?
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Solution
Circumference of a circle =
2
π
r
where r is the radius of the circle
Let
r
1
and
r
2
are radii of two circles respectively.
r
1
r
2
=
3
:
2
(Given)
Now, the ratio of their circumference
=
2
π
r
1
2
π
r
2
=
r
1
r
2
=
3
:
2
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