Formula Index

# Perimeter of a Pentagon Formulas & Calculator

The perimeter of a pentagon can be calculated using the following formula: if you know the length of a side.

## Formula Knowing the Side

If you know the length of one of the sides of the pentagon, you can calculate its perimeter using the following formula:  $$"perimeter" = S * 5$$

Pentagon Side Length

Perimeter result

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### Where:

$$5 = "number of sides in a pentagon"$$
$$S = "side"$$

## Formula for Irregular Pentagon

If you know the length of each sides of the pentagon, you can calculate its perimeter using the following formula: $$"perimeter" = s1 +s2 +s3 + s4 +s5$$

Irregular Pentagon Sides Length

Perimeter result

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### Where:

$$5 = "number of sides in a pentagon"$$
$$S = "side"$$

## Pentagon Definition

It is a geometric figure with 5 sides, all the sides have equal length. Also a regular pentagon has all the same angles. All regular pentagons look the same.

An irregular pentagon can have vitually infinite posibles shapes, Despite this all have 5 sides.

## Perimeter Definition

A perimeter is defined by the outer path of a shape. The shape is always in 2 dimensions. The perimeter is the total length of the exterior path. Another way of looking at this is to think of it as the boundary length of a shape.

In the case of a circle, the perimeter is called a circumference.

Perimeter has a Greek origin, "peri" means "around", and "meter" means "measure". So perimeter means "measure around".

## Formula Definition

It is a representation of a rule or a general principle using letters. (Algebra, A. Baldor)
When describing formulas in plural, it is also valid to say "formulae".

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