Polígono

Regular-polygon calculator

Give it any one measurement — side, radius, or circumference — and the other two re-solve around it, along with the angles, apothem, area, and the smallest rectangle the shape fits inside: the number that tells you how much material a cut needs.

Download the Android app (APK · 129 KB) Try it in the browser

After downloading the APK, open it and allow
“install from unknown sources”.

Built for my father, so the app itself is in Spanish. One HTML file is both the web page and the Android app — no network at any point.
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