2008/12/10 John Randall <[EMAIL PROTECTED]>: > My initial thought is this: Draw the first 3 sides A->B->C. Let D be the > other vertex. Then ABCD is convex iff D lies on the opposite side of the > line AC from B. This gives probability at least 1/2 for your question.
ABCD will still be concave if D is, e.g., on the opposite side of BC from A. ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
