Answer
$9.56 \ square \ units $
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 $s=\dfrac{a+b+c}{2}$
Therefore, $s=\dfrac{9+6+4}{2}=9.5$
In order to find the area of the triangle, we will have to substitute the data into Heron's formula.
$K=\sqrt{9.5(9.5-9)(9.5-6)(9.5-4)} \approx 9.56 \ square \ units $
