Explore the Sine and Cosine trigonometric functions of a right triangle. As you drag the dots around, the triangle will change and show you the new lengths of it's sides as well as the angle at the RED dot corner. The sine (Sin) and cosine (Cos) of the angle at the RED dot corner are also calculated. Hopefully from this diagram, you can see how the Sin and Cos functions are useful for solving for the length of the sides of a right triangle if you have the Hypotenuse and the angle: Adacent = Hypotenuse * Cosine of Angle Opposite = Hypotenuse * Sine of Angle These functions are very handy to programmers who are trying to calculate the X and Y coordinates of a point positioned at a known angle and distance from another point.
