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 $$\pi = \frac{22}{7}$$]
The diameter of a circle is 42 cm.
diameter of a circle =Â $$2\times\ radius\ =\ 42$$
So the radius of a circle = 21 cm
Difference between the lengths of the circumference and the radius of the circle =Â $$2\times\pi\ \times radius-radius$$
= $$2\times\frac{22}{7}\times21-21$$
=Â $$2\times22\times3-21$$
= $$132-21$$
= 111 cm
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