Question

THE RATIO OF RADII OF TWO CIRCLES IS 5:3. FIND THE RATIO OF THEIR CIRCUMFERENCE .

Answer 1

Answer

Let the radii of the given circles be 5x and 3x respectively and let their circumferences be C

1

and C

2

respectively.

Circumference of a circle =2πr

Then, C

1

=2×π×5x=10πx and C

2

=2×π×3x=6πx

∴

C

2

C

1

=

6πx

10πx

C

2

C

1

=

3

5

Hence, the ratio of the circumference of the given circles is 5:3

Answer 2

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