Law of Cosines

loc_IntersectionCalc

//Law of cosines - cos angle = ((Ladj side 1)^2+(Ladj side 2)^2-(Lopposite)^2) / (2(Ladj side 1)(Ladj side 2)) 
double LAdj1=0;
double LAdj2=0;
double LOpp=0;
		
LAdj1=Math.sqrt(Math.pow(B.getX()-A.getX(),2)+Math.pow(B.getY()-A.getY(),2));
LAdj2=Math.sqrt(Math.pow(C.getX()-B.getX(),2)+Math.pow(C.getY()-B.getY(),2));
LOpp=Math.sqrt(Math.pow(C.getX()-A.getX(),2)+Math.pow(C.getY()-A.getY(),2));
		
theta=Math.acos((Math.pow(LAdj1, 2)+Math.pow(LAdj2, 2)-Math.pow(LOpp, 2))/(2*LAdj1*LAdj2));