Han and Priya were making a kite. Han cut out a piece of fabric so that there were 2 short sides of the same length on top and 2 long sides of the same length on the bottom. Priya cut 2 pieces of wood to go across the diagonals of the kite. They attached the wood like this: Kite, by Schoolfreeware. Public Domain. Source. Han asked Priya to measure the angle to make sure the pieces of wood were perpendicular. Priya said, "If we were careful about the lengths of the sides of the fabric, we don't need to measure the angle. It has to be a right angle." Complete Priya's explanation to Han.