Question

Find the side (in cm) of a cube whose surface area is 294 ${\text{cm}}^2$.

• A. 7

Answer 1

The correct option is A 7
Given
Surface area of cube = 294 ${\text{cm}}^2$
$\because$ Surface area of a cube = $6\times {\text{side}}^2$
$\Rightarrow 6\times {\text{Side}}^2=294$
$\Rightarrow \text{Side}=\sqrt{\frac{294}{6}}=\sqrt{49}$
$\Rightarrow \text{Side}=7\text{cm}$

$\therefore$ 7 cm is the side of a cube whose surface area is 294 ${\text{cm}}^2$.