To find the area of a circle, you can use the formula:
\[ \text{Area} = \pi r^2 \]
where \( r \) is the radius of the circle. The radius is half of the diameter. Given that the diameter is 140 feet, we can calculate the radius as follows:
\[ r = \frac{140}{2} = 70 \text{ feet} \]
Now, substituting the radius into the area formula:
\[ \text{Area} = \pi (70)^2 \] \[ \text{Area} = \pi \times 4900 \] \[ \text{Area} \approx 3.14159 \times 4900 \approx 15419.88 \text{ square feet} \]
Therefore, the area of the circle is approximately \( 15419.88 \) square feet.