Question

The area of two circles are in the ratio 49:64.Find the ratio of their circumferences.

Answer 1

Answer:

We are given area

Let the radius of the first circle be r and the radius of the second circle be r'

Given, πR²/πr² = 49/64

=> R²/ r² = 49/64

=> R/r= 7 /8

Now,

2πR/2πr = 2 × 22 /7 ×7 / 2 × 22 /7 ×8

= 7/ 8

Hence, the ratio is 7 :8.

Answer 2

Answer:

area of circle is πr^2

so

πr2/πr2=49/64

=R/R=√49/64

=R/r=7/8

=πR/πR=7/8

now multiple and divide by 2

2πr/2πr=7/8 answer