Hi, I have to find the perimeter of a circle for math class. Can you explain how to do that?
user
Sure! There’s a formula that will let us easily calculate it. We’re going to use the following notation, which I hope you’re familiar with:

C = pi * r * 2.

First, I’m going to write down some equations that are already easy for us to solve:

circumference = 2 * pi * r

circle radius = r

I hope you’re seeing where I’m going with this! We can solve for r to get the formula for the circle’s radius:

r = circumference / (2 * pi)

...which leads to:

c = pi * r * 2

So, we can now calculate the circumference of the circle in two different ways.

(1) We know the circumference (c) from above. We can use the formula for the area of a circle to find the radius (r).

(2) We can also use the formula for the area of a circle to solve for the radius (r) and plug that in for c to get the circumference (c).

How about that!?
assistant
Okay, I guess what I want is circumference, not perimeter, I got confused for a second. This circle has a radius of 8, so I multiply that by 2, and get 16, then I multiply by pi? How much is pi?
user
We have a formula for calculating pi, which is 3.14.  I can explain how we find that too, if you’re interested.
assistant
That's all right. So my circle's circumference would be 16, times pi, or 50.27?
user
That’s right! Let’s keep practicing and solving other problems.
assistant
Hi, I have to find the perimeter of a circle for math class. Can you explain how to do that?
user
Sure! There’s a formula that will let us easily calculate it. We’re going to use the following notation, which I hope you’re familiar with:

C = pi * r * 2.

First, I’m going to write down some equations that are already easy for us to solve:

circumference = 2 * pi * r

circle radius = r

I hope you’re seeing where I’m going with this! We can solve for r to get the formula for the circle’s radius:

r = circumference / (2 * pi)

...which leads to:

c = pi * r * 2

So, we can now calculate the circumference of the circle in two different ways.

(1) We know the circumference (c) from above. We can use the formula for the area of a circle to find the radius (r).

(2) We can also use the formula for the area of a circle to solve for the radius (r) and plug that in for c to get the circumference (c).

How about that!?
assistant
Okay, I guess what I want is circumference, not perimeter, I got confused for a second. This circle has a radius of 8, so I multiply that by 2, and get 16, then I multiply by pi? How much is pi?
user
We have a formula for calculating pi, which is 3.14.  I can explain how we find that too, if you’re interested.
assistant
That's all right. So my circle's circumference would be 16, times pi, or 50.27?
user
Correct, that’s called Pi R squared.  Pi R squared is also very commonly called Pi R squared, or 3.14 * R squared.
assistant
Hi, I have to find the perimeter of a circle for math class. Can you explain how to do that?