The image above is a rectangular prism.

To compute the volume of a rectangular prism requires three essential parameters which are the length, width and height of the rectangular prism.

V = lwh

Where;

V = Volume of the rectangular prism

l = Length of the rectangular prism

w = Width of the rectangular prism

h = Height of the rectangular prism

Let’s solve an example;

Find the volume of a rectangular prism with a length of 18 cm, a width of 12 cm and a height of 21 cm.

This implies that;

l = Length of the rectangular prism = 18 cm

w = Width of the rectangular prism = 12 cm

h = Height of the rectangular prism = 21 cm

V = lwh

V = 18 x 12 x 21

V = 4536

Therefore, the **volume of the rectangular prism** is **4536 cm ^{3}.**

**Calculating the Length of a Rectangular Prism using the Volume, Width and Height of the Rectangular Prism. **

l = ^{V} / _{wh}

Where;

l = Length of the rectangular prism

V = Volume of the rectangular prism

w = Width of the rectangular prism

h = Height of the rectangular prism

Let’s solve an example;

Find the length of a rectangular prism with a width of 19 cm, a height of 24 cm and a Volume of 250 cm^{3}.

This implies that;

w = Width of the rectangular prism = 19 cm

h = Height of the rectangular prism = 24 cm

V = Volume of the rectangular prism = 250 cm^{3}

l = ^{V} / _{wh}

l = ^{250} / _{19 x 24}

l = ^{250} / _{456}

l = 0.55

Therefore, the** length of the rectangular prism** is **0.55 cm.**