The circumference of a circle is calculated using the formula:
Circumference = 2πr,
where "r" represents the radius of the circle and "π" represents the mathematical constant pi (approximately 3.14159).
Given that the circumference of the circle is 81.64 feet, we can set up the equation:
81.64 = 2πr.
To find the radius, we need to isolate "r" in the equation. We can divide both sides of the equation by 2π:
81.64 / (2π) = r.
Using a calculator, we can evaluate the right side of the equation to find the value of "r." Let's calculate it:
81.64 / (2π) ≈ 13.00.
Therefore, the circle's radius is approximately 13.00 feet.
I hope this helps! :)