To find the area of a rectangle, you can use the formula:
\[ \text{Area} = \text{length} \times \text{width} \]
In your case, the length is 18 ft and the width is 5 ft.
Calculating the area:
\[ \text{Area} = 18 , \text{ft} \times 5 , \text{ft} = 90 , \text{ft}^2 \]
So, the area of the rectangle is \(90 , \text{ft}^2\).