What is "diagonals intersecting at a parallogram"? 1. The problem statement, all variables and given/known data The lengths of the diagonals of a parallelogram are 10 ft and 16 ft. Find the lengths of the sides of the parallelogram if the diagonals intersect at an angle of 28 degrees. 2. Relevant equations Law of Cosines Law of Sines ?? 3. The attempt at a solution http://i80.photobucket.com/albums/j199/pugfug90/mimo.gif [Broken] Umm.. Where do I put the 28 degrees?