Question

The volume of a cube of side $a$ units is cubic units.

• A. $6a^3$
• B. $6a^2$
• C. $4a^2$
• D. $a^3$

Answer 1

The correct option is D $a^3$

Volume of a rectangular prism
$=\text{Length}\times \text{Width}\times \text{Height}$

A cube is a rectangular prism with:
Length = Width = Height

$\therefore$ Volume of a cube
$=\text{Side}\times \text{Side}\times \text{Side}$

Given:
The cube of side length $a$ units:

$\therefore$ Volume
$=a\times a\times a$
$=a^3$ cu units