(a)
The angle is .
Convert the angle into radian measure.
\ \
(b)
(a) The angle is .
(b) The angle is .
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=724c8264f20d95d3fb7e089526e83427.png\")
. ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a16232ee95fd1eeba9b9934f11a5fd5e.png\")
\ \
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step2.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a55b674bc9bd11f9d4ffcc01ca0bfb93.png\")
. ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=20595f7adcb8c81d04efe05a42c345d6.png\")
\ \
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=4b6ccbf6a43c382dc582acc339273694.png\")
. ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a1c7aa3a1527a7484d556e4ebcd666d2.png\")
.