sine
the ratio of the opposite side and the hypotenuse of a right triangle (opposite/hypotenuse) or y/r
In trigonometry, the sine function (often abbreviated as sin) is one of the six primary functions used to relate the angles (or sides) of a right triangle. It is defined as the ratio of the length of the side opposite an acute angle in a right triangle to the hypotenuse of the same triangle.
In mathematical notation, the sine function is written as sinθ, where θ is the measure of the angle in radians. The value of sinθ can range from -1 to 1, with negative values indicating a negative angle direction from the positive x-axis and positive values indicating a positive angle direction from the positive x-axis.
The sine function also has many applications outside of geometry, such as in signal processing, physics, and engineering. It is a periodic function that oscillates between 1 and -1, with a period of 2π.
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