Answer
$72\ ft^2$
Work Step by Step
Convert both measurements to the same unit. Since the answer is to be expressed in square feet, convert both measurements to feet.
$base(b)=3\ yd\times\frac{3\ ft}{1\ yd}=9\ ft$
$height(h)=8\ ft$
Substitute to find the area.
$A=bh=9\times8=72$
