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Perimeter of a Decagon Formulas & Calculator

The perimeter of a decagon 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 decagon, you can calculate its perimeter using the following formula:

Decagon Perimeter

$$"perimeter" = S * 10$$

Decagon Side Length

Perimeter result

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Where:

$$10 = "number of sides in a decagon"$$
$$S = "side"$$

Decagon Definition

A decagon is a plane geometric shape or polygon of 10 sides. It also has 10 angles and 10 vertices. The decagon can be regular or irregular.

A regular decagon has all 10 sides of equal length and equal distance from the center. It looks very symmetrical. All regular decagons look the same.

An irregular decagon on the other hand can have sides of different shapes and angles. There is a virtually infinite amount of variations for an irregular decagon, so that they can all look very different from each other. Despite these differences, they will always have 10 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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