Triangle Calculator
Use SSS side lengths to verify a triangle, calculate perimeter and Heron area, and find all angles and classifications. Calculate it clearly with Figur.
Triangle Calculator
Use SSS side lengths to verify a triangle, calculate perimeter and Heron area, and find all angles and classifications.
Method and assumptions
Figur validates the triangle inequality for three sides (SSS), calculates perimeter and area with Heron's formula, and obtains angles in degrees using the law of cosines.
- All three sides are positive finite lengths in the same unit.
- Each side must be shorter than the sum of the other two.
- Right, acute, or obtuse classification is derived from squared side lengths with a small numeric tolerance.
Sources and references
Frequently asked questions
What is the triangle inequality?
Each side must be shorter than the sum of the other two sides.
How are the angles calculated?
They are calculated in degrees with the law of cosines.