Doug C. answered • 08/13/18

Math Tutor with Reputation to make difficult concepts understandable

Another option for finding the area of any triangle when you know all three sides is to use Heron's formula.

First make sure that the numbers a,b,c (sides of the triangle) actually form a triangle. The sum of any two sides must be greater than the 3rd side.

Find the semi-perimeter ("s") which is (a+b+c)/2.

The by Herons' formula A = sqrt[s(s-a)(s-b)(s-c)].

See the following to get the answer for this problem:

https://www.desmos.com/calculator/rhmgaha5wn