Circle Equation Calculator
Center x (h)
Center y (k)
Radius
The standard form of a circle equation is (x − h)² + (y − k)² = r², where (h, k) is the centre and r is the radius. This form makes it easy to identify the centre and radius directly.
- 1Standard form: (x − h)² + (y − k)² = r²
- 2Centre is at (h, k)
- 3Radius r = √[(x−h)² + (y−k)²]
- 4Area = πr², Circumference = 2πr
Centre (2, 3), r = 5=(x − 2)² + (y − 3)² = 25
Centre (0, 0), r = 7=x² + y² = 49
| Radius | Area | Circumference |
|---|---|---|
| 1 | 3.14 | 6.28 |
| 5 | 78.54 | 31.42 |
| 10 | 314.16 | 62.83 |
| r | πr² | 2πr |
References
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