It Figures

Two figs meet on a ship traveling from the Mediterranean to the USA.
(Hey, it happens!)
Naturally they discuss the portholes and the fact that they're all round.
They begin to wonder, if a square has four sides and a pentagon five, and so on, how many sides does a circle have?
Is it too many to count? Is it infinity?
After talking about shapes, including the spectacular megagon, they finally arrive at a simple and elegant conclusion, which means they will be friends forever!