To calculate the circumference of a circle, you can use the formula:
\[ C = 2\pi r \]
where \( C \) is the circumference, \( \pi \) is approximately 3.14, and \( r \) is the radius.
Given that the radius \( r = 2.5 \) feet:
\[ C = 2 \times 3.14 \times 2.5 \]
Calculating this:
\[ C = 6.28 \times 2.5 \] \[ C = 15.7 \text{ feet} \]
So, the estimated circumference of the circle to the tenths place is 15.7 feet.