How do I make an object move in a circle

I was having a problem understanding how do I make a ball move in a circle. I don't know how to start and the only idea I came up with is to make coordinates and move the ball to those coordinates. Does anyone know how to do this???

Do you know trigonometry yet?
(sin and cos)

Should the ball move under its own power, or be dragged by the user on a circular track?

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This might help:

or this