annulus-area
Enter the measurements and review the result.
A QUICK WALKTHROUGH
How to use this tool
- Enter valid finite measurements.
- Apply the formula.
- Review the result and units.
Formula and valid domain
A = π(R² − r²); inputs must satisfy outer radius R > inner radius r ≥ 0. Use one consistent unit. Double precision is used and displayed decimals are rounded.
GOOD TO KNOW
Common questions
How are units handled?
Use one consistent unit; the corresponding square or cubic unit is retained.
Is displayed precision rounded?
Yes. The formula is applied at double precision and displayed decimals are rounded.