How it works
Validate triangle inequality; use a sorted, stable Heron product for area and the cosine rule for angles.
Input definitions
- Side a
- Enter the value in the labeled unit.
- Side b
- Enter the value in the labeled unit.
- Side c
- Enter the value in the labeled unit.
A worked example
- Side a
- 3
- Side b
- 4
- Side c
- 5
Assumptions & limits
Mathematical calculation using the stated inputs; not a measurement guarantee.
Sources & review
Maintained by AnsRio. Methods and examples use automated checks; this does not imply independent professional certification.
Method updated 2026-10-17. Content checked against the stated method and examples. Our verification approach.
Common questions
Can I check the result before using it?
Compare the worked example with your inputs and use the stated method: Validate triangle inequality; use a sorted, stable Heron product for area and the cosine rule for angles.. Confirm input units and boundary choices before relying on the result.
How does the Triangle solver from three sides tool work?
Validate triangle inequality; use a sorted, stable Heron product for area and the cosine rule for angles.
What are the assumptions and limits of Triangle solver from three sides?
Mathematical calculation using the stated inputs; not a measurement guarantee.