The ratio of the perimeters of two circles is 5 : 4. What is the ratio of their radii? Class 9

The ratio of the perimeters of two circles is 5 : 4. What is the ratio of their radii? Class 9

Question 1.

The ratio of the perimeters of two circles is 5 : 4. What is the ratio of their radii? Class 9

Solution:

Ratio of perimeters of two circles = 5 : 4

∵ Perimeter of a circle = 2πr

∴ Ratio of perimeters = 2πr₁ : 2πr₂

= r₁ : r₂

∴ The ratio of their radii is 5 : 4