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__Introduction__

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

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# 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;

Figure - 15.1
## Perimeter of a decagon

# Output

## Area of a decagon

# Output

__References__

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