a). \ \ The angle .
Convert the angle into degrees. \ \
.
b). \ \ The angle .
Convert the angle into degrees.
Therefore, \ \ (a).The angle . \ \ (b).The angle .
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.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step2.JPG\")
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.![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
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. \ \
(b).The angle ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=c00e68915b30e9bea615b4cf75514ada.png\")
.