Answer
$9 \ \text{m} ^2$.
Work Step by Step
The area is computed by $A = a \cdot b$.
Here, we substitute $a = 12$ and $b=\frac{3}{4} $. From this it follows that the area $A$ is computed by:
$A = a \cdot b = 12 \cdot \frac{3}{4} = \frac{12}{1} \cdot \frac{3}{4} = \frac{3}{1} \cdot \frac{3}{1} = \frac{3 \cdot 3}{1} = \frac{9}{1} = 9$.
With considering the unit, the answer is $9 \ \text{m} ^2$.
