The triangle touching the unit circle at points (x,y) determines the sine and cosine functions.
For detailed information on the sine and cosine functions, go to Function and Relation Library: Trigonometric Functions - sine or cosine. |
Zero Degrees, Zero Radians, Zero | |
First Quadrant | |
90 Degrees,
/2 Radians,
| |
Second Quadrant | |
180 Degrees,
Radians,
| |
Third Quadrant | |
270 Degrees,
3/2 Radians,
3/2 | |
Fourth Quadrant |
© 2007, Agnes Azzolino www.mathnstuff.com/math/spoken/here/2class/330/unittan.htm |