What would you consider it a behavior of? A 2d shape, of which circle is one. *Calculating* area is a behavior.
You're over-thinking this--I'd encourage you not to get hung up on semantics whenever possible. And it's almost always possible.
Joined: Oct 13, 2005
Welcome to the Ranch
Circles are easy to work out the fields of; in 2-D they can never have more than 3 fields. Radius, x-position and y-position (of the centre). The area is derivative of the radius and is therefore calculated from it.