A = (6, -5)
B = (9, -5)
Direction = Vector(A, B)
AngleU: (atan2(y(Direction),x(Direction)) * 180 / π) + 180
C = (13, -5)
D = (11, -3)
Plane = Vector(C, D)
AngleV: (atan2(y(Plane),x(Plane)) * 180 / π) + 180
dot: (Direction * Plane)
lu = Length(Direction)
lv = Length(Plane)
Heading: (0 / 180 / 2 * π)
angle: (acos(dot / ((lu * lv))) / π * 180)
Aspect: AngleU - AngleV