## Introduction

A decagon is a ten-sided polygon or 10-gon, which means that it has ten equal side. Calculate its perimeter and area.

# Decagon Formulas Calculator

## Introduction

A decagon is a ten-sided polygon or 10-gon, which means that it has ten equal side. Calculate its perimeter and area.

# Description

A decagon is a ten-sided polygon or 10-gon, which means that it has ten equal side. Calculate its perimeter and area.

$a$, Symbol for Side;
$p$, Symbol for Perimeter;
$A$, Symbol for Area;

## Perimeter of a decagon

$10a$

# Output

## Area of a decagon

$\frac{5}{2}{a}^{2}\sqrt{5+2\sqrt{5}}$

# Output

## References

Figure - 15.1 https://www.tutorvista.com/content/math/area-of-a-decagon/