This self checking worksheet uses Sine and Cosine values only in Degrees with the domain of all real numbers. The solutions are in the middle of the worksheet. The student will see problems on the right column and the left column. The student will match up two problems to the same solution. For example: Sin(120) may be on the left side of the page and cos 60 may be on the right side of the page. The student is to connect these problems to the same solution which is located somewhere in the middle: (Sq root 3)/2. Upon completion of these matches, the solution to a riddle will appear.