m
Clockwise rotations of
p
n
q
60˚ about A then U
map flag F onto flag F'.
F
This is equivalent to a
clockwise rotation of
120˚ about a point C.
F'
30˚
This is also equivalent
to reflections in mirror
lines m then n, then p
then q.
A
30˚
U
Choose equivalent mirror lines to construct the position of C.
Maths Medicine
D
GEO
RR
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