We show the sine in the unit circle. The unit circle is a circle with radius .
The hypotenuse of the triangle in the unit circle has a length of 1. In this case sine is equal to the opposite:
The sine function is the length of the opposite with regards to the angle . One can easily observe that:
This is the plot of the sine function between 0 and :
Here are some values of the sine functions that are worth remembering:
|Alpha in degree||Alpha in radians||Value of sine of alpha|