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5 ft.

Shape: Circle
Circumference Formula: C = 2πr
What is the circumference of a circle with a radius of 5 feet?
Use 3.14 for pi (π).
C = [?] ft.

1 answer

To calculate the circumference of a circle using the formula \( C = 2\pi r \), where \( r \) is the radius of the circle:

Given:

  • Radius \( r = 5 \) feet
  • Use \( \pi \approx 3.14 \)

Now, substitute the radius into the formula:

\[ C = 2 \times 3.14 \times 5 \]

Calculating it step by step:

  1. Calculate \( 2 \times 3.14 \): \[ 2 \times 3.14 = 6.28 \]

  2. Then multiply by the radius (5): \[ 6.28 \times 5 = 31.4 \]

Thus, the circumference \( C \) of the circle is:

\[ C = 31.4 \text{ ft.} \]