geometry calculator

Regular Hendecagon Circumradius Calculator

Keep this page handy for situations where a hand calculation would be slow or easy to miscopy around regular hendecagon circumradius.

Important Use Notice

Informational calculator only. Verify important outputs independently before legal, tax, medical, engineering, safety-critical, contractual, employment, or compliance use.

Estimate

Enter job values, review the estimate, then use the decision hints before ordering or quoting.

Estimate Results

Enter values to see the result.

Formula

circumradius = side / (2 x sin(pi / 11))

The circumradius is the distance from the polygon center to any vertex in a regular hendecagon.

Each side and angle must match for the formula to hold.

Example

Side Length 6 gives Circumradius 10. 6484.

Check

Using the right formula with the wrong measurement label or axis.
Switching between degrees and raw ratios without noticing the change.

Next Step

Next Calc

Regular Dodecagon Circumradius Calculator

Next: regular dodecagon circumradius.

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Regular Hendecagon Apothem Calculator

Next: regular hendecagon apothem.

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Regular Hendecagon Area Calculator

This page is tuned for clean geometry checks during drafting or homework around regular hendecagon area.