Question

Find the ratio of the circumferences of two circles whose radii are in the ratio 4:5
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Answer 1

Answer:

the ratio of the circumferences is also equal =4:5

Answer 2

Answer:

let the radius of the circle be = x

the radius of the first circle = 4x

the radius of the second circle = 5x

circumference of the circle = 2πr

circumference of the first circle = 2. 22/7 . 4x

circumference of the second circle= 2 .22/7. 5 x

the ratio of the circumference = circumference of first circle / circumference of second circle

= 2.22/7.4 x / 2.22/7.5x

=4x/ 5x

= 4/5

=4:5