Question

If the ratio of the areas of two circles is 9:1 then the ratio of their perimeter is​

Answer 1

Answer:

ratio of perimeter = 3 : 1

Step-by-step explanation:

area of 1st circle = πr1^2

area of 2nd circle = πr2^2

a / q , πr1^2 / πr2^2 = 9 / 1

r1^2 / r2^2 = 9 / 1

r1 / r2 = 3 : 1

now , perimeter of circle 1 = 2πr1 = 6π

perimeter of circle 2 = 2πr2 = 2 π

then , ratio of perimeter = 6π / 2π

ratio of perimeter = 3 : 1