Mathematics

Problem

A rectangular sheet measures

30\,\text{cm}\times20\,\text{cm}

. A circular hole of radius

5\,\text{cm}

is punched out from it. Which calculation gives the area of the remaining sheet? a)

(30+20)^{2}-\pi(5)^{2}

30\times20+\pi(5)^{2}

30\times20-\pi(5)^{2}

30\times20-\pi(10)^{2}