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 ft, the radius \( r \) will be:
\[ r = \frac{140 , \text{ft}}{2} = 70 , \text{ft} \]
Now, plug the value of the radius into the area formula using \( \pi \approx 3.14 \):
\[ \text{Area} = 3.14 \times (70 , \text{ft})^2 \]
First, calculate \( (70 , \text{ft})^2 \):
\[ (70 , \text{ft})^2 = 4900 , \text{ft}^2 \]
Now, multiply this by \( \pi \):
\[ \text{Area} = 3.14 \times 4900 , \text{ft}^2 \]
Calculating this gives:
\[ \text{Area} = 15,386 , \text{ft}^2 \]
Therefore, the area of the circle is 15,386 ft².