Education Technology

Exploring Triangle Proportions Using Cabri Junior 2.0

Published on 04/28/2005

Activity Overview

Students will construct a triangle, the segment joining the midpoints of two sides, take measurements of angles and sides to make conclusions and complete the theorem by discovery.

Before the Activity

The students will be exploring the similarity theorem: If a line segment joins the midpoints of two sides of a triangle, the segment is parallel to the third side and is half the length of the third side.

During the Activity

Students will construct a triangle, the segment joining the midpoints of two sides, take measurements of angles and sides to make conclusions and complete the theorem by discovery

After the Activity

Review student results:

  • As a class, discuss questions that appeared to be more challenging
  • Re-teach concepts as necessary