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 Axis of Symmetry:  A line that a figure can be folded over so that one-half of the figure matches the other half perfectly; a line about which a figure is symmetrical.

Symmetry Lines: Determine the number of symmetry lines a polygon has.

Symmetry Lines II: Find polygons that have line symmetry.

SAM: Explore symmetry with altitudes and medians.

Symmetry of Polynomial Functions: Describe the symmetry of a function.