Checking for intersection of surfaces

Hi, I want to know how to check for intersections between two surfaces in the same plane?For example I would like to plot all points on a circle which does not lie within a rectangle.

Thanks

Answer 1

[Matt J]

Depends on what the "surfaces" are. In the case of a rectangle, or other polygon, you would probably use INPOLYGON.

For more complicated things, you would probably use inequalities describing the region

f(x,y)<=0

to disqualify points.