### what is the perimeter of a circle formula?

The formula for the perimeter of a circle is:

Perimeter = 2πr

where “r” represents the radius of the circle, and π is a mathematical constant approximately equal to 3.14159.

**For example,** let’s say we have a circle with a radius of 5 units. We can calculate its perimeter using the formula:

Perimeter = 2π(5)

Plugging in the values, we get:

Perimeter = 2 * 3.14159 * 5

Calculating further, we have:

Perimeter ≈ 31.4159 units

So, the perimeter of a circle with a radius of 5 units is approximately 31.4159 units.

**example 2**

Let’s consider another example:

Suppose we have a circle with a radius of 8 centimeters. To find its perimeter, we can use the formula:

Perimeter = 2πr

Plugging in the values, we get:

Perimeter = 2 * 3.14159 * 8

Calculating further, we have:

Perimeter ≈ 50.26544 centimeters

So, the perimeter of a circle with a radius of 8 centimeters is approximately 50.26544 centimeters.