Question

the perimeter of a rectangle is 40 cm and its breadth is 8 cm find its length

Answer 1

Hey !!




Let length of rectangle be X cm.



Perimeter of rectangle = 40


2 ( Length + Breadth ) = 40


2 ( X + 8 ) = 40



X + 8 = 20



X = 20 - 8


X = 12 cm.


Hence,

Length of rectangle = X = 12 cm.

Answer 2

Perimeter = P = 40cm

2(l + b) = 40

b = 8cm

l = ?

2 (l + 8) = 40

    l + 8 = 40 ÷ 2

          l = 20 - 8

∴ l = 12cm