.
Observe the graph :
About this graph lies in third quadrant.
The angle lies in third quadrant because that is the only quadrant in the sine and cosine are negative.
The angle lies in third quadrant.
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=c03c7c32c4e03ecd502bd3c26d465ee2.png\")
.![\"\"](\"/userfiles/image/Library/Trigonometry/graph_by_trigonametry_values.gif\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=401dfc03d5a8a06a3a1afbe88b95cc4f.png\")
lies in third quadrant. lies in third quadrant because that is the only quadrant in the sine and cosine are negative.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
lies in third quadrant.