Help on a Geometry question

Answer 1

"Two regular polygons both have n sides. One of the polygons is inscribed in an the other is circumscribed about a circle of radius r. Fin d the area between the two polygons in terms of n and r."

I think it is asking for the pace that would be between the outsides of the shapes, but I don;t know. I keep looking over the formulas and I am utterly lost. Anyone major in geometry, or has come across his question before?

Answers dog come lacks ya know, some actual lengthy questions so I am going to put in the answer the question being asked.