A name which has nothing to do with this question (well almost nothing)

What percentage of the circle is shaded? (The quadrangle shown in the picture is a square with one of the vertices in the circle's center.)

Is the angle on the center of the circle a right angle? The way it is drawn I would say so, but i can't be sure. The quadrilateral doesn't have to be regular (all right angles) for the solution to be 25%. But the "center" angle has to be, and if it is indeed 90 degrees, then the shaded area is 25%.

Posted by lucky on 2002-07-03 21:55:29