Trigonometry: Trigonometry is a branch of mathematics that deals with relationships between angles and sides in triangles, especially right triangles.
Sine Function: The sine function (sin(x)) is another trigonometric function that gives us the ratio of the length of the opposite side to the hypotenuse in a right triangle.
Unit Circle: A unit circle is a circle with radius 1 centered at the origin. It helps visualize angles and their corresponding trigonometric functions.