On my homework I have a question that says, "The points N, R, and P are on the circle below. Point M is in the center of the circle. Connect three points to form a central angle." Below the question it shows a big circle with points R, N, P, and M.

This is on a state test from 2009. My class did not learn what central angles are. Can someone please tell me what a central angle is or what it looks like?

Thanks,

WWE