The Polygon Perimeter from Area and Number of Sides calculator computes the Perimeter of a polygon based on the polygon's area (A) and number of sides (n). 
INSTRUCTIONS: Choose units and enter the following:
- (n) Number of sides of the regular polygon
- (A) Area of the polygon
Perimeter of a Polygon (P): The calculator returns the perimeter in meters. However, this can be automatically converted to compatible units via the pull-down menu.
The Math / Science
A regular n-sided polygon is a polygon with n equal length sides and is a polygon which has n equal angles at the n vertices of the polygon. This formula uses the polygon area equation:
`A = (n * s) / (4 * tan(pi/n))` to solve for s. This is the length of a side corresponding with a polygon of n sides and an area of A. The circumference is simply stated as follows:
` "Polygon Circumference" = s * n`
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- Length of the Sides of a Polygon based on the Outer Radius and Number of Sides
- Length of a Side of a Polygon from Inner Radius and Number of Sides
- Perimeter of a Polygon from Number of Sides and Length of Sides
- Polygon Perimeter from Outer Radius and Number of Sides
- Polygon Perimeter from Inner Radius and Number of Sides
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