Question

The measurements of some rectangles are given in the table below . However , they are incomplete . Find the missing information .

Length	Breadth	Area	Perimeter
20 cm	14 cm
	12 cm		60 cm
15 cm		150 cm

Answer 1

$\left(i\right)l=20cm,b=14cm$

Area =$20\times 14=280$ cm${}^2$

Perimeter =$2(l+b)=2(20+14)=68$ cm

$\left(ii\right)b=12cm$, Perimeter = 60 cm

$2(l+b)=60$

$2(l+12)=60$

$2l+24=60$

$2l=36$

$l=18$

Area = $18\times 12=216$ cm${}^2$

$\left(iii\right)l=15cm$, Area = 150 cm

Therefore $b=10cm$

Perimeter = $2(l+b)=2(15+10)=50$ cm${}^2$