Question

A circle of circumference $88cm$ is cut out of a square sheet of paper of side $30cm$. What is the area of the paper left?

Answer 1

Circumference $=88cm$

$2\pi r=88$

$r=\frac{88\times 7}{22\times 2}$

$r=14cm$

Area of circle $=\pi r^2$

$=\frac{22}{7}\times {14}^2$

$=616c{m}^2$

Area of sheet $=30\times 30$

$=900$

Remaining area $=900-616=284c{m}^2$