The circumference of a circle can be calculated by using this formula:
[tex]C=2\pi r[/tex]
Where "r" is the radius of the circle.
In this case, you know that:
[tex]\begin{gathered} C=15.7ft \\ \pi\approx3.14 \end{gathered}[/tex]
Then, you can substitute values into the formula and solve for "r":
[tex]\begin{gathered} 15.7ft=(2)(3.14)r \\ \\ \frac{15.7ft}{(2)(3.14)}=r \end{gathered}[/tex][tex]\begin{gathered} \frac{15.7ft}{6.28}=r \\ \\ r=2.5 \end{gathered}[/tex]
Hence, the answer is:
[tex]2.5\text{ }feet[/tex]
