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Dictionary: Symmetry
A figure has symmetry if it looks the same after a reflection, rotation or other transformation.
f(-x) = f(x) → line symmetry about the y-axis
Line symmetry: The figure is mirrored about a straight line.
Point symmetry: The figure looks the same after a 180° rotation.
A parabola is always symmetric about a vertical line through the vertex.
In nature: Snowflakes, flowers, the human body.
Symmetry is what we see at a glance.
— Blaise Pascal (1623–1662)
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