Definition:Sine

Definition from Circle
The sine of an angle in a right triangle can be extended to the full circle as follows:

Also see

 * Equivalence of Definitions of Sine of Angle


 * Definition:Cosine
 * Definition:Tangent Function
 * Definition:Cotangent
 * Definition:Secant Function
 * Definition:Cosecant


 * Definition:Hyperbolic Sine
 * Definition:Inverse Sine


 * Properties of Real Sine Function