Concave polygon Concave polygon A simple polygon that is not convex is called concave, non-convex or reentrant. A concave polygon will always have at least one reflex interior angle—that is, an angle with a measure that is between 180 degrees and 360 degrees exclusive. Some lines containing interior points of a concave polygon intersect its boundary at more than two points. Some diagonals of a concave polygon lie partly or wholly outside the polygon. Some sidelines of a concave polygon fail to divide the plane into two half-planes one of which entirely contains the polygon. None of these three statements holds for
360 Degrees of Billy Paul At 16 I was working with Charlie Parker. He's one of the giants. Coming from a jazz background it was one of the greatest things to happen for any singer because of the fact I took an interest at heart but learned to build on it. When I say that I just didn't want to be labeled as a jazz singer but like my new album, the one that "Me & Mrs. Jones" is on, it's called "360 Degrees of Billy Paul" and that means I'm covering all of the territories." In its November 25, 1972, issue, "Billboard" wrote: "Billy