How it works
Surface area covers the full sphere. The inverse square root selects the positive physical radius rather than a negative branch. This form solves for radius; enter the known quantities in Surface area.
Inputs and units
| Input | Example value | What to enter |
|---|---|---|
| Surface area | 113.09733552923255 cm² | Formula symbol: S. Required unit: cm². Must be greater than zero. |
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.
- Surface area
- 113.09733552923255 cm²
Complete example results
- Radius
- 3 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