The formula for the circumference of a circle is: C equals 2 pi r.

Question

 
C is the circumference and r is the radius. Use 3.14 as an estimate for pi.
Question
Which is the approximate circumference of a circle with a radius of 7 meters?

Answer 1

To find the approximate circumference of a circle with a radius of 7 meters, you can use the formula:

\[ C = 2 \pi r \]

Given that \(\pi\) is estimated as 3.14, you can substitute the radius \(r\) with 7 meters:

\[ C = 2 \times 3.14 \times 7 \]

Now, calculate it step by step:

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

2. Then, multiply that result by the radius (7 meters): \[ 6.28 \times 7 = 43.96 \]

So, the approximate circumference of the circle is 43.96 meters.