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