PLEASE LOOK AT THE IMAGE ATTACHED ITS VERY IMPORTANT

Step-by-step explanation:

So, you wanna be a master?

Do you have the skills to be number 1?

(If not, I'll help you lol)

Okay, let's define what a circumference is.

Circumference - The entire outside of a circle, think of it as the "perimeter" of the circle, like how there is a perimeter for a triangle or square.

The equation for finding the circumference is as follows:

r - the radius, or half-way line is a circle.

So, you see the number thats on a half way line in the circle? That is the radius. All you have to do is plug in that number into the equation (for r), and you get the answer.

#3

r = 15

Now use a calculator and type in 30, then times it by pi (which is this symbol: )

Circumference = 94.248

#4

r = 10

Circumference = 62.832

idk

step-by-step explanation: