Do your students have trouble identifying whether to use Sine or Tangent? This self checking worksheet is for your students. This worksheet has 15 triangles which are laid out in all types of positions. The students are given a triangle and the choices of Sine, Cosine, Tangent or None. They must compare the fraction given to the triangle and identify which trig function, if any, is represented. When finished, the students will find a solution to a riddle.