Chapter 14 Symmetry

  • Chapter 14

    Chapter Objective:

    * Figures can have line and rotational symmetry.


    line of symmetry - A line of symmetry is a line that divides a figure into two congruent (identical parts - same shape and size) parts. The parts match exactly when folded on the line.

    symmetric figure - A symmetric figure is a figure with two congruent (identical parts - same shape and size) parts that match along the line of symmetry. A figure can have more than one line of symmetry.

    rotation - The rotation is the change in position that occurs when a shape is turned about a point. This point is called the center of rotation.

    rotational symmetry - A figure has rotational symmetry if it can be rotated less than a full turn (360°) around a center and look the same as it did before the turn.