Question

r = [?] ft.
C = 131.88 ft.
Shape: Circle
Calculate the radius (r) of a circle with a circumference of 131.88 feet.
d = C ÷ π/2
Use 3.14 for π

Answer 1

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**.