Newsgroups:sci.mathSubject:A neat little theorem.From:wft@math.canterbury.ac.nz (Bill Taylor)Date:3 Jun 92 16:15:40 +1200Organization:Department of Mathematics, University of Canterbury

Given any convex quadrilateral, trisect each of the sides. Join up the corresponding points on opposite sides with straight lines (like a skewed tictactoe board). Prove that the central one of the nine sub-quadrilaterals, has area one ninth of the area of the original. --- Bill Taylor wft@math.canterbury.ac.nz