How it works
The area is bounded by two radii and their arc. Angles are entered in degrees, converted to radians, and cannot exceed a full circle. This form solves for radius; enter the known quantities in Area, Angle.
Inputs and units
| Input | Example value | What to enter |
|---|---|---|
| Area | 12.566370614359172 cm² | Formula symbol: A. Required unit: cm². Must be greater than zero. |
| Angle | 90 ° | Formula symbol: theta. Required unit: °. Must be greater than zero. Allowed range: 0.0000001–360. |
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.
- Area
- 12.566370614359172 cm²
- Angle
- 90 °
Complete example results
- Radius
- 4 cm
Reading the result
The result solves for radius 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 radius 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