Answer
$7, 517.38 \ square \ feet $
Work Step by Step
According to Heron's formula, the area of a triangle with sides $a,b$ and $c$ is given by:
$K=\sqrt{s(s-a)(s-b)(s-c)}$; where $s=\dfrac{a+b+c}{2}$
We have: $a=6, b=5, c=8$
So, $s=\dfrac{87+190+173}{2}= 225$
In order to find the area of the triangle we will have to substitute the data in Heron's formula.
$K=\sqrt{225(225-87)(225-190)(225-173)}=7, 517.38 \ square \ feet $
