Answer:
[tex]\pi r2[/tex] or [tex]\pi d[/tex]
Step-by-step explanation:
To find the circumference, you must first find either the diameter or the radius.
To find the diameter, you can multiply the radius twice.
To find the radius, you can divide the diameter by 2.
Once you have the diameter, you then multiply it by pi, also known as 3.14.
OR
Once you have the radius, you them multiply it by pi, also known as 3.14, and then multiply your product by 2.
