Angle
Author 
Message 
Flikerator

Posted: Wed Apr 19, 2006 7:15 am Post subject: Angle 


If im given three coordinates how do I find the angle of the three points? (That they make with each other).
Like (2,1) (3,0) (5,7)
At (3,0) the forumula for the angle would be 





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Andy

Posted: Wed Apr 19, 2006 9:59 am Post subject: (No subject) 


ever heard of cosine law?
this shouldnt be in general programming.
moved 





MysticVegeta

Posted: Wed Apr 19, 2006 1:52 pm Post subject: (No subject) 


Find distance between them (Math.Distance)
Name the sides, A, B, C;
A^2 = B^2 + C^2  2*B*C*cos(A)
plugin, vals, find cos A, use inverse get angle 





codemage

Posted: Thu Apr 20, 2006 9:05 am Post subject: (No subject) 


That's odd. I distinctly remember the last time I used COS law, and it was thinly sliced cabbage. 





zylum

Posted: Thu Apr 20, 2006 10:42 am Post subject: (No subject) 


ha ha ha! 





Flikerator





Andy

Posted: Thu Apr 20, 2006 12:04 pm Post subject: (No subject) 


why dont you check if it's an obtuse angle and if it is just find the reflex of the reflex 






