Triangle Calculator
The Triangle Calculator computes missing sides or angles from what you know, using trigonometry and the laws of sines and cosines.
Key Features
- Solve by sides or angles
- Area and perimeter
- Right-triangle mode
- Local only
Use Cases
- Check a geometry problem
- Lay out a structure
- Teach trigonometry
- Verify a measurement
How to Use
- Enter the known values
- Solve
- Read sides and angles
Practical Tips
- Right triangles are simplest
- Degrees versus radians matters
- Three angles sum to 180
FAQ
- Which law?
- Sine law for opposite pairs, cosine for included angle.
- Units?
- Consistent length units throughout.