The circumference of the two circles is 308 cm and 440 cm respectively. What is the difference between their radii?

21 cm

We know that,

Circumference of the circle = 2πr

Now, according to the question,

= 308 = 2 × \(\frac{22}{7}\) × r₁

= r₁ = 49 cm

Also,

440 = 2 × \(\frac{22}{7}\) × r₂

= r₂ = 70 cm

Difference between the radius and the circle = r₂ - r₁ = 70 - 49 = 21 cm