Shape 

Copyright David & Cynthia Thomas, 2009

 

Symmetry--Directed Activity: Line Symmetry

                                                               

Focus

Line of symmetry

Technologies

Metric ruler and The Geometers Sketchpad and model 4_Lines.gsp

Background

 

Figure 4.2: Lines of Symmetry

Tasks

For each object in Figure 4.2

·        Draw a line of symmetry.

·        Draw a segment between two vertices that are “images” of each other relative to the line of symmetry.

·        Describe the relationship between the segment and the line of symmetry.

·        Repeat using The Geometers Sketchpad and model 4_Lines.gsp

·        Formulate and test a conjecture concerning all such segments.