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Online calculator to calculate the area of a triangle using heron's formula. This fomula is used when all three sides of a triangle are given. let a, b and c be the lengths of the three sides of the triangle. The area of this triangle is given by:
A = sqrt [ s * (s - a) * (s - b) * (s - c) ]
where s in the above formula is given by s = (1 / 2)(a + b + c).
How to use the calculator
Enter the three sides a, b and c, of the triangle, as positive real numbers and press "enter". The output is the area and the triangle. For the three sides a, b and c to define a triangle, the sum of the lengths of any two sides must be larger than the length of the third side. Note that if the three sides do not define a triangle no answer is displayed.
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