The diameter of a circle is 42 cm. What is the difference between the lengths of the circumference and the radius of the circle? [Use π = $\frac{22}{7}$]

111

We know that,

Circumference = 2πr

We are given,

Diameter = 42 cm

Now, according to the question, 

= Diameter = 42

= R = 21

So, The circumference = 2πr = 2 × \(\frac{22}{7}\) × 21 = 132 cm

Now, the difference between Circumference and radius is = 132 – 21 = 111 cm