Perimeter of a Rectangle Calculator

This Perimeter of a Rectangle Calculator helps you find the total distance around a rectangle when the width and length are known. It uses the formula P = 2(w + l), where w is the width, l is the length, and the answer is written in units. Add the width and length, then multiply by 2 to get the perimeter. It is a simple way to check answers, understand the rectangle perimeter formula, and practise basic geometry step by step.

In the diagram, the width is w and the length is l.

Step-by-step method

1. Identify what is given.
2. Write the formula.
3. Substitute the values and calculate the perimeter.

Formula:

Example 1:

Step 1 - Identify what is given.

In this problem: The given dimensions are \(w = 5\) and \(l = 3\).

Step 2 - Write the formula.

In this problem: Use the rectangle perimeter formula: \(P = 2(l + w)\).

Step 3 - Substitute the values and calculate the perimeter.

In this problem: Substitute \(l = 3\) and \(w = 5\): \(P = 2(3 + 5) = 2(8) = 16\).

Final answer:

Example 2:

Step 1 - Identify what is given.

In this problem: The given dimensions are \(w = 7.5\) and \(l = 2\).

Step 2 - Write the formula.

In this problem: Use the rectangle perimeter formula: \(P = 2(l + w)\).

Step 3 - Substitute the values and calculate the perimeter.

In this problem: Substitute \(l = 2\) and \(w = 7.5\): \(P = 2(2 + 7.5) = 2(9.5) = 19\).

Final answer: