Question

If area of a square is $64{\text{cm}}^2$, then perimeter of the square will be

• A. 42 cm
• B. 32 cm
• C. 16 cm
• D. 8 cm

Answer 1

The correct option is B 32 cm

$\text{Area of square}={\text{(side)}}^2$
$\Rightarrow {\text{(side)}}^2=64{\text{cm}}^2$
$\therefore \text{(side)}=\sqrt{64{\text{cm}}^2}=8\text{cm}$

$\text{Perimeter of square}=4\times \text{side}$
$=4\times 8\text{cm}$
$=32\text{cm}$