To calculate the radius of a circle given its circumference, we can use the formula for the circumference of a circle:
\[ C = 2\pi r \]
Where:
- \( C \) is the circumference,
- \( r \) is the radius,
- \( \pi \) is approximately 3.14.
Given that the circumference \( C \) is 131.88 feet, we can rearrange the formula to solve for the radius \( r \):
\[ r = \frac{C}{2\pi} \]
Now, substituting the values into the equation:
\[ r = \frac{131.88 \text{ ft}}{2 \times 3.14} \]
Calculating the denominator:
\[ 2 \times 3.14 = 6.28 \]
Now, substituting this back into the equation for \( r \):
\[ r = \frac{131.88}{6.28} \]
Now, perform the division:
\[ r \approx 21.0 \text{ ft} \]
So, the radius \( r \) of the circle is approximately 21.0 feet.