Maintaining Mathematical Proficiency
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The blue and the red figure are almost identical. The difference is that they are facing the opposite way. If you think of a mirror, could that be a hint?
Reflection
From the picture we can see that the red figure is very similar to the blue figure. The only difference is that the red figure is pointing in another direction than the blue one.
Imagine that you look yourself in the mirror. Then you see a reflection of yourself. It is almost a copy but everything is in the opposite way. It is the same thing with the red figure, it's a reflection of the blue one.