Question

The circumference of a circle exceeds the diameter by $16.8$ cm. Find the radius of the circle.

Answer 1

Let the radius of the circle be $r$ cm.

Diameter $=2r$ cm and Circumference = $2\pi r$ cm

Therefore,

$2\pi r=2r+16.8$

$2\times \frac{22}{7}\times r=2r+16.8$

$44r=14r+16.8\times 7$

$30r=117.6$

$r=3.92$

Hence, radius $=3.92$ cm