Question

The perimeter of a rectangle is 40 cm. If its breadth is 8 cm, what is its length?

Answer 1

Hint: In this question, we would simply find the length of the rectangle by applying the formula of the perimeter i e;$2\left( {l + b} \right).$

Complete step-by-step answer:
Now, here,
Given parameters of rectangle = 40 cm & breadth = 8 cm.
Let length be l.
Perimeter of rectangle = 2 (l + b)
     $ \Rightarrow 2\left( {l + b} \right) = $ 40 cm
     $ \Rightarrow 2l + \left( {2 \times 8} \right)$ cm = 40 cm
     $ \Rightarrow 2l = \left( {40 - 16} \right)$ cm
     $2l = 24$ cm
$l = $ 12 cm

Length of the rectangle is 12 cm.

Note: In this type of problems, where you are asked about the length of a rectangle when its perimeter & breadth are given, apply the formula of perimeter.