Circle Equation
Write a circle equation from its centre and radius.
Your numbers
Circle equation
Use consistent units. The result follows the assumptions you enter.
Scenario comparison
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Formula
(x−h)²+(y−k)²=r²
Write a circle equation from its centre and radius.
Worked example
- Centre x
- 1
- Centre y
- 2
- Radius
- 3
- Circle equation
- (x - 1)² + (y - 2)² = 9
- Radius squared
- 9
Scope and limitations
Use consistent units. The result follows the assumptions you enter.
Inputs are checked for missing values and allowed ranges. A result outside the finite numeric range is not displayed. Rounding affects display, while the calculation uses the model’s numeric precision.
Check your units and assumptions before relying on a result. Changing a label does not convert a currency or physical unit.
Formula version: daaf63f9bb17 · Example checked: