Circular Area and Boundary
Find the area and circumference of a circular feature using its radius. Useful for circular beds, tanks, or paving outlines.
How to use Circular Area and Boundary
- Enter “Radius”, using the units and limits shown in its label.
- Select Calculate or Process. Review the result and any validation message before copying or downloading available output. Reset clears the result and restores the starting inputs.
Method & assumptions
Area = πr²; circumference = 2πr.
Worked example
Radius 10 gives area about 314.159 and circumference about 62.832.
Results and projections are informational estimates, not financial, medical, legal, tax, or property advice. Check assumptions, units, rounding, and local requirements independently. Investment illustrations do not guarantee returns. Keep original files and check transformed output before use.
Questions, answered
Can I enter the diameter?
Divide the diameter by two first. The field asks for the distance from the centre to the boundary.
Where does this calculation run?
It runs locally in your browser. Enter plain numbers without currency symbols or thousands separators; use the same currency and measurement units throughout unless a converter explicitly asks for units.