The circumference of the two circles is 110 cm and 330 cm respectively. What is the difference between their radii ?

35 cm 

We know that,

Circumference of a circle  = 2πR

The circumference of the two circles = 110 cm and 330 cm

Let the radii of the bigger and smaller circles be R and r respectively.

According to the question,

2πR - 2πr = 330 - 110

= 2π(R - r) = 220

= \(\frac{44}{7}\) × (R - r) =  220

= (R - r) = 35