Question

Can you help me find the area of that paper that remains?

Answer 1

The diagram is given.

To determine the area of the paper that remains.

First calculate the area of rectangle , using the formula.

$A=l\times w$$A=27\times12=324sq.\operatorname{cm}$

The diameter of semicircle is given 12 cm.

To calculate the area of semicircle , use the formula.

$A=\frac{\pi}{2}(r^2)$$A=\frac{3.14}{2}\times(\frac{12}{2})^2=56.52sq.cm$

Then the area of paper that remains will be the area of rectangle subtracted from area of two semicircle .

$A=324-(2\times56.52)=324-113.04=210.96sq.cm$

Hence the area of paper that remains is 210.96 sq.cm.