How it works
The circumcircle passes through the vertices. A side subtends 2π/n radians at the centre; side count is an integer of at least three. This form solves for side length; enter the known quantities in Circumradius, Side count.
Inputs and units
| Input | Example value | What to enter |
|---|---|---|
| Circumradius | 4 cm | Formula symbol: R. Required unit: cm. Distance from the centre to the edge; half the diameter. Must be greater than zero. |
| Side count | 6 | Formula symbol: n. Enter a numeric value. Use a whole number. Must be greater than zero. Allowed range: 3–10,000. |
Worked example
Show example inputs and results
This example is generated by the same calculation engine using the starting values in the form. Your own inputs produce your own result.
- Circumradius
- 4 cm
- Side count
- 6
Complete example results
- Side length
- 4 cm
Reading the result
The result solves for side length from the entered quantities. Check the result unit and the formula conditions before using it.
Questions and answers
Can I use the example values for my own calculation?
The example values illustrate the calculation. Replace every input with your own information, especially dates, rates and the selected operation.
When can I use the side length result?
Lengths use cm, areas cm² and volumes cm³ on one consistent scale. The positive real branch is selected; the supplied quantities must describe the stated shape.
Why are some results rounded?
Results display up to 8 decimal places. Calculations use the unrounded values; very small values use scientific notation. JavaScript floating-point arithmetic can introduce tiny rounding differences.
Are my inputs sent to a server?
The calculator processes inputs in your browser. Its code does not send your values to a server.
Method sources: openstax.org