Answer
$$A = 7587\ ft^2$$
Work Step by Step
We first find the area of the rectangle:
$$ A = bl \\ A= (60\ ft)(45\ ft + 45\ ft + 30 \ ft + 30 \ ft) \\ A = (60\ ft)(150 \ ft ) \\ A = 9000 \ ft^2$$
The area of the semi circle is:
$$ A= \frac{1}{2} \pi (30\ ft)^2 \\ A = 1413\ ft^2 $$
Now, we subtract off the area of the semi-circle since it is not included in the second level. Doing this, we find:
$$ A = 9000 \ ft^2 - 1413\ ft^2 \\ A = 7587\ ft^2$$
