Question

Find the radius of a circle whose circumference is 176 cm.

Answer 1

Let the radius of the given circle be r cm.
Circumference of the circle = 176 cm
Circumference = 2πr
∴ 2πr=176
$\Rightarrow r=\frac{176}{2\pi }$
$\Rightarrow r=\frac{176\times 7}{2\times 22}$
⇒r=28
The radius of the given circle is 28 cm.