Question

The lateral surface area of a cube of side a is ______ .

• A. $4a^2$
• B. $12a^2$
• C. $2a^2$
• D. $6a^2$

Answer 1

The correct option is A $4a^2$

Lateral surface area of a cube is the sum of areas of 4 of its faces, excluding the areas of top and bottom faces.
The area of each face of a cube of side 'a' is $a^2$.
$⟹$ The sum of areas of 4 faces = $4a^2$
$\therefore$ Lateral surface area of a cube of side 'a' is equal to $4a^2$ .