I am a clueless math noob, and I hope the overlords of the internet can help me explain, what I cannot.

Hopefully someone can explain, not only the formula itself, but also learn my how I can understand it.

The problem is as follows:

I want to describe the orbit of an object in a formula.

The object travels in a circular path, but is controlled by an arm, set off-center from the center of its path.

The arm rotates in a constant speed.

So my problem is, how can I describe this in mathematically?

Thanks for reading my post