Question

The length of the side of a square-shaped farm whose perimeter is $120abkm$ is

• A. $40abkm$
• B. $30abkm$
• C. $20abkm$
• D. $50abkm$

Answer 1

The correct option is B

$30abkm$

Given perimeter = $120abkm$.
Let the side of the square-shaped farm be $s$ m.
In a square, all sides are equal.

∴ $s+s+s+s$ = Perimeter
⇒ $4s$ = $120ab$
$\therefore$ s = $120ab÷4$
⇒ $s$ = $30abkm$