This is a perfect to introduction to trigonometric ratios. This contains notes on sine, cosine and tangent. It also includes 9 trig problems for cooperative learning. Students can go around the room and place the triangles in their corresponding columns. Or the assignment can be scaffolded by using the sheet that already has the triangles in the correct columns. This document also contains the Angles of Elevation and Angles of Depression notes. Answer keys are provided for the notes and activity.