B
E
F
G
H
I
A
C
D
J
(x+9,y)
(x-9,y)
(x,y-9)
(x,y+9)
(x-11,y)
(x,y+11)
(x,y-11)
(x+11,y)
(x+8,y-3)
(x+8,y+3)
(x-8,y-3)
(x-8,y+3)
(x-7,y-5)
(x-7,y+5)
(x-5,y-7)
(x+7,y+5)
X axis
y axis
y=x
90 C
180
90 CCW
90 CC
180 to point 2,1
(-2,-1)
(-1.2)
(1.-2)
(2,1)
90 c to point -3,4
(-4,-3)
(4,3)
(-4,3)
3,-4
(1,-2)
(-1,2)
(5,-7)
(-5,7)
(7,5)
(-7,-5)