because its quite hard and even harder than it looks and a mirror dosent really work
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One type of symmetry is rotation. The second type of symmetry is translation. The third type of symmetry is reflection.
I am a kid and have no problems with reflective symmetry but some kids might It could be that some just don't understand it just like You cant teach a 2 year old the Pythagorean therom and have them now what it means
It can be thought of rotational symmetry along the axis
I am a kid and I have no difficulties but some kids might
rotation, reflection, translation, glide reflection