http://www.RoboRealm.com/ The newest forum threads. Tue, 30 Nov 1999 00:11:00 EST en-us Copyright: (C) RoboRealm, http://www.RoboRealm.com/ http://www.RoboRealm.com/ Have a look at the atan2 function. Using that you can find the angle at point E by subtracting one line's angle from the other.<br><br>If you are still stuck post what you have tried so far.<br><br>STeven. http://www.roborealm.com/forum/index.php?thread_id=3648 http://www.roborealm.com/forum/index.php?thread_id=3648 Tue, 30 Nov 1999 00:11:00 EST i have five points A,B,C,D,E. a line passing through points A,B and another line passing through C,D intersect at E. i would like to know the angle made by these two lines at point E with reference to the line AB(positive angle or negative angle made by line CD with respect with AB).<br>please help me with a formula using points A,B,C,D.<br>Thank you. http://www.roborealm.com/forum/index.php?thread_id=3648 http://www.roborealm.com/forum/index.php?thread_id=3648 Tue, 30 Nov 1999 00:11:00 EST