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 360 Degrees of Billy Paul 360 Degrees of Billy Paul is an album by soul singer Billy Paul. It was produced by Kenny Gamble and Leon Huff and arranged by Bobby Martin, Lenny Pakula and Norman Harris. Released in 1972, it includes the Grammy Award-winning number 1 pop and soul single "Me and Mrs. Jones" and its follow-up "Am I Black Enough for You?" which reached number 29 on the soul chart and number 79 on the pop chart. The album was expanded and remastered by Big Break Records for compact disc in 2012 with three bonus tracks, new liner