Material Required: Strip of paper, pen.
This is a puzzle similar to a jigsaw puzzle, where students have to put together 16 square pieces to form a larger square.
All the pieces have trigonometric ratios or numerical values written along their four edges. The pieces will have to be assembled in such a way that at each joint, the trigonometric ratio and the numerical value correspond. Students are easily attracted to the game and can spend a long time attempting to solve the puzzle. A sample chart of 8in<math>\times</math>8in is shown in the figure, from which the 16 pieces can be cut. The level of difficulty can be reduced by marking the outside edges and the corners differently instead of with numerical values. Another chart with trigonometric identities is also shown. After the first game becomes easy, the second chart game can be introduced. It is also possible to design similar charts which can be cut into pieces shaped like triangles or hexagons.