Find the length of a rectangle if its breadth is 20.5 metre and perimeter 102 m.

Given  :

Breadth of Rectangle  =  20.5 m

Perimeter of Rectangle  =  102 m

To do:

Length of Rectangle  = ?

Solution :

Perimeter of Rectangle  = 2 (length $+$ breadth)

Substitute the given values in the above equation,

102  =  2 (length $+$ 20.5)

$\frac{102}{2}=$length$+$20.5

56  =  length $+$ 20.5

Rewrite,

Length $+$ 20.5  =  56

Length  =  $56 - 20.5$

Length  =  35.5 m

The length of the Rectangle is 35.5 m.