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 Description  
 Line Symmetry:  Figures that match exactly when folded in half have line symmetry.

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.

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.