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Line of Symmetry:  A line that divides a figure into two parts, each of which is a mirror image of the other.
 Consider the square below: Four different axes (or lines of symmetry) are shown. You can prove this by printing this page and cutting out the squares and folding along the dotted lines. The square also has rotational symmetry. If you cut out the square below and place it on a flat surface. Place a pen or pencil on the point in the center of the square. If you rotate that square 90, 180, or 270 degrees clockwise or counterclockwise, the square will look exactly the same as it did before you rotated it. JavaSketchPad pages are provided for you to explore symmetry with quadrilaterals and pentagons. Move the red points until the original figure and the reflection image are superimposed (i.e., when they figure and image are on top of each other). When you have accomplished this the reflection line is now the axis or line of symmetry for the figure.