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The radius of a circle is 4 millimeters. What is the circle's circumference?
r=4 mm
Use ​𝜋 ≈ 3.14 and round your answer to the nearest hundredth.

1 answer

The formula for the circumference \( C \) of a circle is given by:

\[ C = 2\pi r \]

Given that the radius \( r \) is 4 millimeters and using \( \pi \approx 3.14 \), we can substitute the values into the formula:

\[ C = 2 \times 3.14 \times 4 \]

Calculating this step-by-step:

  1. \( 2 \times 3.14 = 6.28 \)
  2. \( 6.28 \times 4 = 25.12 \)

So, the circumference of the circle is:

\[ C \approx 25.12 \text{ millimeters} \]

Rounded to the nearest hundredth, the circumference is \( 25.12 \) mm.