Question

Find the diameter of a circle whose circumference is $1256\text{cm}$. Use $\pi =3.14$

Answer 1

Circumference of the circle is equal to $2\pi r$ where $r$ is the radius of the circle or $\pi d$ where $d$ is the diameter of the circle.

$\begin{array}{cc}\pi d& =1256\\ 3.14d& =1256\\ d& =400\text{cm}\end{array}$

Hence, diameter of the circle is equal to $400\text{cm}$.