The image above is a rhombus.

To compute the area of a rhombus, one essential parameter is needed and this parameter is length of side (a).

The formula for calculating the perimeter of a rhombus:

P = 4a

Where;

P = Perimeter of the rhombus

a = length of side

Let’s solve an example;

Find the perimeter of a rhombus when the length of side is 30 cm.

This implies that;

a = Length of side = 30 cm

P = 4a

P = 4 x 30

P = 120

Therefore, the **perimeter of the rhombus** is **120 cm.**

**Calculating the Length of Side using the Perimeter of the Rhombus.**

a = ^{P} / _{4}

Where;

a = Length of Side

P = Perimeter of the rhombus

Let’s solve an example;

Given that the perimeter of the rhombus is 180 cm. Find the length of side?

a = ^{P} / _{4}

This implies that;

P = perimeter of the rhombus = 180 cm

a = ^{P} / _{4}

a = ^{180} / _{4}

a = 45

Therefore, the **length of side** is **45 cm.**