Question

Find the edge of a cube whose surface area is 432 $m^2.$

Answer 1

$\text{Surface area of a cube}=432m^2$

$\therefore \text{Area of one surface}=\frac{432}{6}=72m^2$

$\therefore \text{Edge of the cube}=\sqrt{72}m$

$=\sqrt{36\times 2}m=6\sqrt{2}m$