Shape 

Copyright David & Cynthia Thomas, 2009

 

Sides, Angles, Interior Lines & Points--Directed Activity: Angle bisectors

                                                                                  

Focus

Bisect a given angle

Technologies

·        The Geometers Sketchpad

·        Paper and pencil

Background

An angle bisector is a line, ray, or segment containing the vertex of the angle that divides the interior of the angle into two congruent angles.  For example, in Figure 2.14, segment BD divides ÐABC such that ÐCBD @ ÐABD. 

Figure 2.14: Angle Bisector

 

Tasks

Bisect a given angle:

·        Using both pencil-and-paper and

·        The Geometers Sketchpad.