Question

The total surface area of a cube is 1350cm${}^2$. Then its side is __________.

• A. 225cm
• B. 15cm
• C. 135cm
• D. 25cm

Answer 1

The correct option is B 15cm

Total surface area = 6 x side${}^2$ = 1350
side${}^2$ = $\frac{1350}{6}$ = 225
$\therefore$side = $\sqrt{2}25$ = 15cm