Answer:
1,216,747,567 square feet.
Step-by-step explanation:
The area of a circle can be calculated as:
![A=\pi\cdot r^2](https://img.qammunity.org/2023/formulas/mathematics/college/c3j55td07q4b6rf8hxaebd9fh4afvxzn0d.png)
Where π is 3.14 and r is the radius of the circle.
Since we need the answer in square feet, we first will convert 6 km to ft. So, if 1 km is equivalent to 3280.84 ft, we get:
![6\operatorname{km}*\frac{3280.84\text{ ft}}{1\operatorname{km}}=19685\text{ ft}]()
Therefore, replacing π is 3.14 and r by 19685 ft, we get that the area of the circle is equal to:
![\begin{gathered} A=3.14\cdot(19685ft)^2 \\ A=1,216,747,567ft^2 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/nbyv8d5ots62eswjlud6x8hxyi7r1eolvx.png)
So, the answer is:
1,216,747,567 square feet.