Triangle area
Area of any triangle from three sides, if they close.
Open a calculatorPythagoras
Leave one side empty. Two legs give the hypotenuse. A leg and the hypotenuse give the other leg, if the hypotenuse is longer. Area is ab/2. Obtuse triangles are not this page — that is Heron.
Hypotenuse
5
Leg a
3
Leg b
4
Area
6
Hypotenuse: 5
3-4-5 is the first integer triple. A floating-point hypotenuse is not always a pretty integer.
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An educational estimate. Not medical, tax or credit advice.