NOTES
TRIGONOMETRY (DEFINITIONS) 01 H 040
After completing this module, you should know and recognize the definitions of the
trigonometric ratios sine, cosine and tangent in right angled triangles and in terms of
coordinates.
3 IMPORTANT DEFINITIONS …
opposite
sin (sine )
hypotenuse
adjacent
cos (cosine )
hypotenuse
opposite
tan (tangent )
adjacent
* “Some old hens cackle and howl till old age”
sohcahtoa
3 IMPORTANT DEFINITIONS in terms of x, y and r.
sin y
r
cos
x
r
tan y
x
