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Circumscribed Circle Calculator
Circumradius and circumcircle area of a triangle from its three sides.
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Circumradius
Compare Your Options And Get Clear Answers
Circumradius and circumcircle area of a triangle from its three sides.
Circumscribed Circle Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: R = abc / (4 x area).
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
Circumscribed Quick Guide
Typical values for reference.
| a | b | c | R |
|---|---|---|---|
| 3 | 4 | 5 | 2.5000 |
| 5 | 5 | 5 | 2.8868 |
| 7 | 8 | 9 | 4.6957 |
| 13 | 14 | 15 | 8.1250 |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Circumscribed Circle Calculator FAQ
Answers to common questions about this calculator.
The circle passing through all three vertices.
R = abc / (4K).
R = abc / (4 x area).
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.