Shape 

Copyright David & Cynthia Thomas, 2009

 

Sides, Angles, Interior Lines & Points--Directed Activity: Parallel lines

                                                                            

Focus

Construct a line parallel to a given line.

Technologies

·        The Geometers Sketchpad

·        Paper and pencil

Background

Parallel lines do not intersect.  For example, segment DE is constructed through point C and parallel to segment AB in Figure 1.16.  Both DE and AB could be extended indefinitely in either direction without intersecting.

Figure 2.16: Parallel Segments

Tasks

Construct a parallel to a given line through a given point not on the line using:

a)      Pencil and paper

b)      The Geometers Sketchpad.