ha ha ha!
Computer Science Canada Angle |
| Author: | Flikerator [ 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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| Author: | Andy [ Wed Apr 19, 2006 9:59 am ] |
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ever heard of cosine law? this shouldnt be in general programming. moved |
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| Author: | MysticVegeta [ Wed Apr 19, 2006 1:52 pm ] |
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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 |
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| Author: | codemage [ Thu Apr 20, 2006 9:05 am ] |
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That's odd. I distinctly remember the last time I used COS law, and it was thinly sliced cabbage. |
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| Author: | zylum [ Thu Apr 20, 2006 10:42 am ] |
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ha ha ha! |
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| Author: | Flikerator [ Thu Apr 20, 2006 11:39 am ] |
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I find point a,b, and c and the distances between them. Then I use the cosine law to find the angle. The only problem is when I have an angle > 180 it takes the reflex of it. I know why, but im not really sure how to fix it ^^; 
http://ic1.deviantart.com/fs10/i/2006/110/4/6/Convex_Polygon___not_so_much_by_Jack_Skellingtin.jpg |
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| Author: | Andy [ Thu Apr 20, 2006 12:04 pm ] |
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why dont you check if it's an obtuse angle and if it is just find the reflex of the reflex |
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