\
The angle is
.
\
Convert a radians measure to degree, multiply by
.
\
\
Degree measure of
is
.
\
\
Degree measure of
is
.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=ca55b19f898a5fe513b0fd5bba288067.png\")
.![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=7ce7ca1cf5ed6685789ae7c7a8910326.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=b8cd8df7c01045f9a69024c99b73db87.png\")
is ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=2e518434f05d62e4cc05b8be3934c663.png\")
.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
is .