Answer
$A=145~in^{2}$
Work Step by Step
Since the hole is a triangle, we use the triangle area formula:
$A=\frac{bh}{2}$
where the lengths are:
$b=26.4in$
$h=11in$
Thus, we have the area:
$A=\frac{(26.4in)(11.0in)}{2}=145.2in^{2}\approx145~in^2$