The image above is a rectangle with a length of 8 cm and a width of 5 cm.

To compute the perimeter of a rectangle requires two parameters which are the **length of the rectangle** and the **width of the rectangle**.

The formula for calculating the perimeter of a rectangle is:

P = 2 (l + w)

Where:

P = Perimeter of a Rectangle

l = Length of a Rectangle

w = Width of a Rectangle

Let’s solve an example:

Find the perimeter of a rectangle where the length of the rectangle is 8 cm and the width of the rectangle is 5 cm.

This implies that:

l = Length of the Rectangle = 8 cm

w = Width of the Rectangle = 5 cm

P = 2 (l + w)

P = 2 (8 + 5)

P = 2 (13)

P = 26

Therefore, the **perimeter of the rectangle** is **26 cm**.

**How to Calculate the Length of a Rectangle when the Perimeter of the Rectangle and the Width of the Rectangle is Given**

l = ^{P} / _{2} – w

Where:

l = Length of the Rectangle

P = Perimeter of the Rectangle

w = Width of the Rectangle

Let’s solve an example:

Find the length of a rectangle where the perimeter of the rectangle is 36 cm and the width of the rectangle is 6 cm.

This implies that:

P = Perimeter of the Rectangle = 36 cm

w = Width of the Rectangle = 6 cm

l = ^{P} / _{2} – w

l = ^{36} / _{2} – 6

l = 18 – 6

l = 12

Therefore, the **length of the rectangle** is **12 cm**.

**How to Calculate the Width of a Rectangle when the Perimeter of the Rectangle and the Length of the Rectangle is Given**

w = ^{P} / _{2} – l

Where:

w = Width of the Rectangle

P = Perimeter of the Rectangle

l = Length of the Rectangle

Let’s solve an example:

Find the width of a rectangle where the perimeter of the rectangle is 120 cm and the length of the rectangle is 10 cm.

This implies that:

P = Perimeter of the Rectangle = 120 cm

l = Length of the Rectangle = 10 cm

w = ^{P} / _{2} – l

w = ^{120} / _{2} – 10

w = 60 – 10

w = 50

Therefore, the **width of the rectangle** is **50 cm**.

Nickzom Calculator – **The Calculator Encyclopedia** is capable of calculating the perimeter of a rectangle.

To get the answer and workings of the perimeter of a rectangle using the **Nickzom Calculator – The Calculator Encyclopedia. **First, you need to obtain the app.

You can get this app via any of these means:

**Web** – https://www.nickzom.org/calculator-plus

To get access to the **professional **version via web, you need to **register** and **subscribe **for** NGN 1,500 **per** annum** to have utter access to all functionalities.

You can also try the **demo **version via https://www.nickzom.org/calculator

**Android (Paid)** – https://play.google.com/store/apps/details?id=org.nickzom.nickzomcalculator

**Android (Free)** – https://play.google.com/store/apps/details?id=com.nickzom.nickzomcalculator

**Apple (Paid)** – https://itunes.apple.com/us/app/nickzom-calculator/id1331162702?mt=8

Once, you have obtained the calculator encyclopedia app, proceed to the **Calculator Map, **then click on **Mensuration**** **under the **Mathematics** section

Now, click on** Perimeter of a Rectangle** under **Mensuration**

The screenshot below displays the page or activity to enter your values, to get the answer for the perimeter of a rectangle according to the respective parameters which are the length of the rectangle (l) and the width of the rectangle (w).

Now, enter the values appropriately and accordingly for the parameters as required by the **example** above where the **length of the rectangle** is **8 cm** and the **width of the rectangle** is **5 cm**.

Finally, click on the **Calculate** button

As you can see from the screenshot above, **Nickzom Calculator** – The Calculator Encyclopedia solves for the** perimeter of a rectangle** and presents the formula, workings and steps too.