Question

The breadth of a rectangle is 3 cm less than
its length. If the area of the rectangle be 40
sq. cm, find its perimeter.​

Answer 1

Step-by-step explanation:

let breadth be b and length be l

now, b = l — 3

$area \: of \: rectangle \: = l \times b$

$40 = l \times (l \: - 3)$

${l}^{2} - 3l \: = 40$

L = 8cm. (by trial and error method)

b = 8 - 3 = 5cm

perimeter = 2(l +b)

= 2(8+5) = 26cm