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4 ft.

Shape: Circle
Circumference Formula: C = 2πr
What is the circumference of a circle with a radius of 4 feet?
Use 3.14 for pi (π).
C = [?] ft.
Do not round the answer.

1 answer

To calculate the circumference of a circle with a radius of 4 feet using the formula \( C = 2\pi r \):

  1. Substitute \( r = 4 \) feet into the formula: \[ C = 2 \times 3.14 \times 4 \]

  2. Calculate: \[ C = 2 \times 3.14 = 6.28 \] \[ C = 6.28 \times 4 = 25.12 \]

So, the circumference of the circle is: \[ C = 25.12 \text{ ft} \]