Reflection
The mirror line could be:
x=-2, x=2, x=4, x=6, y=-2, y=2, y=4, y=6.
Group the points into pairs, where one point is the reflection of the other.
x=-2 is the mirror line for points:
Choose...
B
C
D
E
F
G
H
K
L
M
O
P
Q
S
U
W
X
Y
Choose...
B
C
D
E
F
G
H
K
L
M
O
P
Q
S
U
W
X
Y
Result:
Please enable Java for an interactive construction (with Cinderella).
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MathsNet
2001