Question

The ratio of the radii of two circles is 2:5.Then the ratio of their circumference

Answer 1

Answer:

Answer is 2:5

Explanation:

Let the both radius be 2x and 5x

2x = r

5x = R

Circumference of the circle is : 2πr

So circumference of both ratio will be : 2πr / 2πR

Now, put the value in radius

2π.2x / 2π 5x

2π and 2π will cancel ALSO x and x will also cancel

Remaining will be 2 and 5

So, ratio is 2:5

Answer 2

answer C1:C2=2:5

Explanation:

circumference is 2πr

R1:R2 =2/5 R1 =2R2/5

c1:C2= 2πr1:2πr2

C1:C2= R1:R2=2:5