How this calculator works
Enter the values for side a, side b, side c. The result applies the displayed method and rounds only for presentation.
Formula / method
Area = √(s(s−a)(s−b)(s−c)), where s is the semiperimeter.
Worked example
Worked example: Side A = 3; Side B = 4; Side C = 5.
Assumptions and limitations
The inputs use the units shown and the displayed triangle calculator method applies to the situation being estimated.
This triangle calculator uses the stated formula and supplied units; unusual inputs, local rules or professional context can change the interpretation.