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Triangle Area from Trig Calculator
Compute triangle area from two sides and the included angle using 1/2 ab sin C.
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Compute triangle area from two sides and the included angle using 1/2 ab sin C.
Triangle Area from Trig Estimator
Enter your numbers below for an instant estimate.
0
๐ก Tip: Area = 1/2 x a x b x sin(C).
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
Triangle Quick Guide
Typical values for reference.
| a | b | Cยฐ | Area |
|---|---|---|---|
| 5 | 5 | 90 | 12.50 |
| 8 | 11 | 40 | 28.28 |
| 10 | 12 | 60 | 51.96 |
| 20 | 15 | 120 | 129.90 |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Triangle Area from Calculator FAQ
Answers to common questions about this calculator.
When you know two sides and the angle between them.
Use the sine rule first.
Yes.
Degrees here.