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__Introduction__

An octagon is a eight-sided polygon or 8-gon, which means that it has eight equal side. Calculate its perimeter and area.

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# Description

An octagon is a eight-sided polygon or 8-gon, which means that it has eight equal side. Calculate its perimeter and area.

$a$, Symbol for Side;

$p$, Symbol for Perimeter;

$A$, Symbol for Area;

Figure - 14.1
## Perimeter of an octagon

# Output

## Area of an octagon

# Output

__References__

^{Figure - 14.1} By László Németh - Own work, CC0, https://commons.wikimedia.org/w/index.php?curid=27295120