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Circle Equation from Diameter Endpoints Calculator
Equation of a circle given the two endpoints of a diameter.
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Circle equation
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Equation of a circle given the two endpoints of a diameter.
Circle Equation from Diameter Endpoints Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Centre = midpoint; r = half the distance.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Circle Quick Guide
Typical values for reference.
| x1 | y1 | x2 | Equation |
|---|---|---|---|
| -2 | 3 | 6 | (x – 2.00)^2 + (y – 1.00)^2 = 20.00 |
| 0 | 0 | 4 | (x – 2.00)^2 + (y + 0.50)^2 = 4.25 |
| -3 | -3 | 3 | (x – 0.00)^2 + (y + 2.00)^2 = 10.00 |
| 1 | 5 | 7 | (x – 4.00)^2 + (y – 2.00)^2 = 18.00 |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Circle Equation from Calculator FAQ
Answers to common questions about this calculator.
Find the midpoint for the centre and half the distance for the radius.
(x-h)^2 + (y-k)^2 = r^2.
No.
The radius is zero.