Introduction

This page contains the perimeter formulas for square, rectangle, triangle, and parallelogram. Examples are given to show you how to use these formulas.

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Formula

The lesson on the perimeter of a square will provide the explanation and examples needed to understand this formula. Here's the summary:

All the sides (edges) of a square have the same length. If each side has the length L, the formula for the perimeter, P will be:

Example

Given a square where the side lengths are 3cm. Find the perimeter of this square.

Formula

The lesson on the perimeter of a rectangle will explain the basics needed to use this formula. Here's the summary:

If a rectangle has the length l, and the width w, the perimeter P, will be:

Example

Given a rectangle with the length of 5ft and the width of 3ft. Find its perimeter.

Formula

The lesson on the perimeter of a triangle will explain the basics behind this formula. Here's the summary:

For a triangle with the side lengths of a, b and c, its perimeter P, will be: 

Example

Given a triangle with the side lengths of 3cm, 4cm and 5cm. Find the perimeter of the triangle.

Formula

The lesson on the perimeter of a parallelogram will explain the basics. Here's the summary:

For a parallelogram with side lengths of a and b, the perimeter P, is given as:

Example

Given a parallelogram with the side lengths of 8 inches and 6 inches. Find the perimeter of this parallelogram.