Trigonometric Ratios

Select a trigonometric ratio and move the point around the unit circle. Note the relationship between the location of the point, the angle, the triangles and the graph of the function. Try selecting sine, cosine, and tangent together; tangent and cotangent; sine and cosecant; cosine and secant. Note the segments on the triangles that each ratio represents. You can also click the play button in the lower left to animate.