📐 Geometry Workspace

Four modes for circle area, triangle area, rectangle area and right-triangle hypotenuse.

Choose a calculation

Results update as you type. Use Reset current mode to restore the example. Copy mode link shares the selected formula, not your entered values. Display precision changes presentation only.

Available calculations

Circle area Triangle area Rectangle area Pythagorean theorem

Assumptions and limitations

Area inputs must use a consistent length unit; area is in the square of that unit. The Pythagorean theorem applies only to right triangles.

How to use this tool

Choose a calculation mode, enter valid inputs, and read the result. Each mode is linked from the directory. Calculations happen on your device, with no required account or paid API. Verify consequential financial or technical decisions independently.

Explore the full converter and calculator directory or all OpenToolKit tools.

Additional calculation notes

Population standard deviation divides by the number of observations, not N−1. Greatest common divisor and least common multiple accept safe whole numbers only.