Question

find the radius of a circle whose circumference is 57.2 cm.

Answer 1

let the radius of the circle be r cm.
so 2×22/7×r=57.2
=>r=9.1.
so the radius of the circle is 9.1 cm.

Answer 2

Here is the answer

Circumference of Circle = 2πr

$\bf{ 57.2 = 2 \times 3.14 \times r}$


$\bf{57.2 = 6.28r}$


$\bf{ \frac{57.2}{6.28} = r}$


$\bf{9.10 = r}$

Radius of the circle is 9.10 cm.