Question

Surface area of a cubical box of side length 2 m open at the top is given by:

• A. 24 m²
• B. 16 m²
• C. 18 m²
• D. 20 m²

Answer 1

The correct option is D

20 m²

Given, side of the cube = 2 m
Total surface area of a cube = 6a${}^2$
The given box is open at the top.
So, the total surface area of the given cube will be 5a${}^2$
$\therefore$ Surface area of the box = 5(2)${}^2$
= 20 m${}^2$