If u know the diameter of a circle, how do you find it’s circumference?

Divide it by 2, because the circumference is the distance from the center of a circle to the edge, while the diameter is the distance from the edge of the circle through the center and to the other end.

Diameter * pi = circumference

We’re gonna need a picture to refer to in order to figure it out. try reposting your question with the picture included.