"Trigonometry an Introduction" introduces the trig functions, sine, cosine and tangent. They are used to solve right triangles, oblique triangles, special triangles, and area of triangles. There are a total of 18 pages of problems and activities with two evaluations. This unit was designed for students beginning their study of trigonometry. It is ideal for advanced pre algebra, algebra 1, and geometry classes. The unit could be substituted for or used with the trigonometry chapter in your textbook. All answers included.