AB,CD be the chords
(Substitute CN = ND)
(Apply cross product property)
(Substitute )
(Divide)
The value of .
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=ca9ed6f5fc28a8446365745cb8c49cba.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=c8e38194913b286993d2d075e01057ff.png\")
(Substitute CN = ND)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=86ed92206f29f2cb13ef9cde0156b67c.png\")
(Apply cross product property)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=b3110ff9b8d8f477e887e21310ab8503.png\")
(Substitute ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=e3af529ece5530d38a3ea8d43766b540.png\")
)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=bedd4eb0cd99779f4b4bd7756d3c6bf6.png\")
(Divide)![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
.