If the ratio of the areas of two circles is x^(2) : y^(2), then which of the following will be their radii?

The area of the circle x ^(2) +y ^(2) =a ^(2) is :

If the ratio between the areas of two circles is 4 : 1 then the ratio between their radii will be (a) 1 : 2 (b) 2 : 1 (c) 1 : 3 (d) 4 : 1

The ratio of the radii of two circles is 5:3. Find the ratio of their circumferences,

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

The ratio of the radii of two circles is 3:2. What is the ratio of their circumferences?

The ratio between the area of two circles is 4:7. What will be the ratio of their radii ?

The ratio of radii of two circles is 3:4. Find the ratio of their circumferences.

If the sum of the areas of two circles with radii R_(1) and R_(2) is equal to the area of a circle of radius R, then

The sum of the areas of two circles which touch each other externally is 153pi . lf the swn of their radii is 15, find the ratio of the larger to the smaller radius