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# Calculate the area of the triangle online: the length of the known three sides

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### App Description

Calculate the area of the triangle: the length of the known three sides

It is known that the three sides of the triangle a, b, c, then ($$p=(a+b+c)/2$$)

Triangle area $$S=√[p(p-a)(p-b)(p-c)]$$

Triangle area $$S=(1/4)√[(a+b+c)(a+b-c)(a+c-b)(b+c-a)]$$

### Usage example

Input data: side length a---5; side length b---9; side length c---12, click "calculate" to get the result.

Output: The area of the triangle is 20.396.