Returns angle between two lines marked by four point.
syntax
LinesAngle(Ax;Ay;Bx;By;Cx;Cy;Dx;Dy)
Ax,Ay = coordinates of point "A" first line
Bx,By = coordinates of point "B" first line
Cx,Cy = coordinates of point "C" second line
Dx,Dy = coordinates of point "D" second line
result
Value of angle range <0,90> degree.
example
LinesAngle(-2;0;2;-2;-2;-1;2;2) = N
a/ N = 63,434948822922 degree
b/ N = 1,10714871779409 radian
c/ N = 70,4832764699133 gradus.