Angle

[Flikerator]

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-

[Andy]

ever heard of cosine law?

this shouldnt be in general programming.

moved

[MysticVegeta]

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]

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

[zylum]

ha ha ha!

[Flikerator]

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

[Andy]

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