Sine Definition Geometry

A Visual Guide to the Definition and Meaning of Sine

Sine is a trigonometric function fundamental to geometry and calculus. Defined for an angle in a right-angled triangle, it represents the ratio of the length of the side opposite the angle to the hypotenuse. In the unit circle, the sine of an angle equals the y-coordinate of the corresponding point on the circle. As a periodic function, sine ...

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