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 Challenge
 Rotational Symmetry:  A figure has rotational symmetry if, after rotating it by an angle of 180 degrees or less about its center, the figure lines back up with itself.

Twice Reflected over Intersecting Lines: Find an equation that relates the angles formed by intersecting lines and points reflected over these lines.

Rotating Coordinates: What the location of (x,y) if you rotate 90 degrees counterclockwise? 180 degrees counterclockwise? 270 degrees counterclockwise? Explain how you found your answer.

Transformations: Explore transformations of quadrilaterals.