Triangle calculator
Triangle area with Heron's formula, plus perimeter and height.
Area (Heron's formula)6
Perimeter12
Height relative to side a4
Calculation formula
Area = √(s(s−a)(s−b)(s−c)), where s is half the perimeter
Frequently asked questions
What is Heron's formula?
The area equals the square root of the product of half the perimeter and its difference with each side.
Why isn't a result shown?
The three entered sides must satisfy the triangle inequality; the sum of two sides must be greater than the third side.