A Trigonometry Graphic

The hypotenuse will follow the mouse around the x-y axis. Sine is blue, opposite over hypotenuse, cosine is red, adjacent over hypotenuse, tangent is opposite over adjacent, and the angle is measured from the (0, 0) point on the x-y grid. Note that the triangle is drawn in a quarter sector of a circle with radius one. If you would continue around to the three other quarter sectors of the circle plotting the value of the sine function, you would see a complete sine wave.