Point symmetry exists
when a figure is built around a single point called the center of the
figure. For every point in the figure, there is another point
found directly opposite it on the other side of the center.
Study the diagrams below:
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This figure shows two points and their
reflections through a line. This is line
symmetry. |
This figure shows two points and their
reflections through a point. This is point
symmetry. |
In a point symmetry,
the
center point is a midpoint
to every segment formed by joining a point to its image.
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A
simple test to determine whether a figure has point
symmetry is to
turn it upside-down and see if it looks the same.
A figure that has point symmetry is unchanged in
appearance by a 180 degree rotation. |
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