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ABC Triangle Calculator
Solve a triangle from three sides: angles, area, perimeter and type.
ruler Free Online Tool
โก Instant Results
๐ Clear Comparison
๐ 100% Free Tool
Area
Compare Your Options And Get Clear Answers
Solve a triangle from three sides: angles, area, perimeter and type.
ABC Triangle Estimator
Enter your numbers below for an instant estimate.
0
๐ก Tip: Area = sqrt(s(s-a)(s-b)(s-c)), s = half the perimeter.
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
ABC Quick Guide
Typical values for reference.
| a | b | c | Area |
|---|---|---|---|
| 3 | 4 | 5 | 6.000 |
| 5 | 5 | 5 | 10.825 |
| 7 | 8 | 9 | 26.833 |
| 6 | 6 | 8 | 17.889 |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
ABC Triangle Calculator FAQ
Answers to common questions about this calculator.
Area from three sides using the semi-perimeter.
When one side is as long as or longer than the sum of the other two.
Area = sqrt(s(s-a)(s-b)(s-c)), s = half the perimeter.
It is an estimate based on the inputs you enter. Check real quotes, labels or official guidance for important decisions.