Validate three sides and return a complete triangle measurement set.
Area-
Perimeter-
Angles A / B / C-
Triangle type-
Method
Geometry formulas
Each result is calculated from the dimensions entered using standard Euclidean geometry formulas. The tool checks required constraints such as the triangle inequality and positive lengths.
Unless a unit is explicitly selected, lengths use any consistent unit, areas use its square, and volumes use its cube.
Questions
Triangle Calculator FAQ
How is triangle area calculated from three sides?
Heron formula uses the semiperimeter s: area equals the square root of s(s-a)(s-b)(s-c).
When do three lengths form a triangle?
Each pair of side lengths must add to more than the remaining side.
