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:

All the sides (edges) of a square have the same length. If each side has the length

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:

If a rectangle has the length

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:

For a triangle with the side lengths of

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:

For a parallelogram with side lengths of

Example

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

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Perimeter formulas