Question

The radius of a circle is 7 millimeters. What is the circle's circumference?

Answer 1

The circumference of a circle with a radius of 7 millimeters is 44.0 (rounded to the nearest tenth).

Explanation:

The circumference of a circle is the distance around the outside of the circle. The circumference along with the diameter and radius are the 3 major aspects of a circle.

The circumference of a circle is found using this formula:

• 
  `c=2\pi *r` - or -
  `c=\pi *d`

For this problem, the radius has been given, so to solve, let's use the formula:
`c=2\pi *r`.

It has been given that the radius is equal to 7 and the unit of measure is millimeters.

So to start, let's plug the radius in the formula.

It should look like this:
`C=2\pi *7`

After plugging the radius into the formula, we now have to multiply
`2\pi` by
`7`; resulting in: ≈
`43.9823` (estimate)

Now rounding to the nearest tenth:

≈
`44.0`