Question

the area of a rectangle of 20 metre long is 240 sq.m. Its perimeter is what?

Answer 1

Answer:

64 metres

Step-by-step explanation:

Length= 20 m

Area = 240 Sq. m.

Breadth = (240/20)m

= 12 m

So,

L = 20m

B = 12m

Perimeter = 2(L+B) unit

= 2(20+12)m

= 2(32) m

=64 m

Done!

Answer 2

➤ Given :-

Area of the rectangle :- 240 cm²

Length of the rectangle :- 20 metres

➤ To Find :-

Perimeter of the rectangle.....

➤ Solution :-

Breadth :-

$\longrightarrow \sf \: \frac{area \: of \: rectangle}{length \: of \: the \: rectangle}$

$\longrightarrow \sf \:breadth = \frac{240}{20} = 12 \: m$

Now,

$\longrightarrow \sf \:Perimeter = 2 \times (l + b)$

$\longrightarrow \sf \:2 \times (20 + 12)$

$\longrightarrow \sf \:2 \times 32$

$\longrightarrow \sf \:Perimetre = 64 \: m$

$\Huge\therefore$ Perimeter of the rectangle is 64 m.