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3 ft.

Shape: Circle
Circumference Formula: C = 2πr
What is the circumference of a circle with a radius of 3 feet?
Use 3.14 for pi (π).
C = [?] ft.
Do not round the answer.

1 answer

To find the circumference of a circle using the formula \( C = 2\pi r \), we will substitute the values for \( \pi \) and \( r \).

Given:

  • Radius \( r = 3 \) feet
  • \( \pi \approx 3.14 \)

Now, plug in the values:

\[ C = 2 \times 3.14 \times 3 \]

Calculating step-by-step:

  1. First, calculate \( 2 \times 3.14 \): \[ 2 \times 3.14 = 6.28 \]

  2. Now, multiply this result by the radius (3 feet): \[ 6.28 \times 3 = 18.84 \]

Thus, the circumference \( C \) of the circle with a radius of 3 feet is:

\[ C = 18.84 \text{ ft} \]

Final answer: \[ C = 18.84 \text{ ft} \]