Question

1. the area of a rectangle is 72 cm². the width is 4 cm. find the perimeter.

Explanation:

Step1: Find the length

We know area $A = l\times w$. Given $A = 72\ cm^{2}$ and $w = 4\ cm$, so $l=\frac{A}{w}=\frac{72}{4}=18\ cm$.

Step2: Calculate the perimeter

The perimeter formula of a rectangle is $P = 2(l + w)$. Substitute $l = 18\ cm$ and $w = 4\ cm$ into it, $P=2(18 + 4)=2\times22 = 44\ cm$.

Answer:

$44\ cm$