A
B
C
D
x =
x + y =
Triangle F'G'H' is to triangle FGH.
The orientation of the vertices of triangle F'G'H' the same as the orientation of the vertices of triangle FGH.
E
Proportional
Non-proportional
Situation 1
Situation 2
Situation 3
Situation 4
(x, y + 4)
(-x, y)
(x, y + 8)
(x, -y)
(-y , x)
y = x +