Question

The ratio of the radii of the two circles is 4 : 7. Find the ratio of their circumference.

Answer 1

Answer:

Ratio of two radii =4:7

circumference of two circles= 2π4:2π7(circumference of circle =2πr , where π= 22/7 & r = radius of the circle)

that means= 2π4/2π7 (2π gets cancelled in numerator and denominator) =4/7

so , ratio of their circumference=4/7 or 4:7

Answer 2

Answer:

Mark as a brilliant please

Step-by-step explanation:

Ratio ofCircumference of two circles=4:7

2πr₁/2πr₂=4/7

r₁/r₂=4/7

Now,

Ratio of their areas=πr²₁/πr₂²=4²/7²=16/49