Question

The area of a square is 289 cm². Find its perimeter.

• A. $64cm$
• B. $68cm$
• C. $60cm$
• D. $72cm$

Answer 1

The correct option is B $68cm$

Area of a square of side ${}^{\prime }{a}^{\prime }$ is $a^2.$

Here, area, $a^2=289c{m}^2$

$\Rightarrow a=\sqrt{289}=17cm$

Perimeter of a square of side ${}^{\prime }{a}^{\prime }$ is $4a.$

$\therefore$ Perimeter of the square $=4\times 17=68cm$