Geometry & Measurement Calculators
Regular Polygon Calculator
Calculate area, perimeter, apothem and angles of a regular polygon.
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What is Regular Polygon?
A regular polygon has all sides and all angles equal. Its area follows from the perimeter and the apothem, the distance from the centre to a side.
How it works
We compute the apothem with a half-angle tangent, derive the area as perimeter × apothem / 2, and the angles from (n−2)·180°/n.
- Enter your input. Type or paste your input into the field above — the tool responds instantly.
- Review the result. Output updates live as you type. Everything runs entirely in your browser.
- Copy or download. Use the Copy button to grab the result, or Download to save it as a file.
Examples
Realistic sample
Type or paste any realistic input — the tool computes the result locally and instantly.
Common mistakes
Expecting a server round-trip
Nothing is uploaded — every tool in this category runs entirely in your browser.