Education Technology

Investigating the Slopes of Parallel and Perpendicular lines

Published on 06/09/2008

Activity Overview

In this activity, students investigate how equations of parallel and perpendicular lines relate to each other. They use the drawing and measurement tools of Cabri™ Jr. to explore the slopes of lines. NCTM Geometry Standards: Analyze characteristics and properties of 2- and 3-dimensional geometric shapes and develop mathematical arguments about geometric relationships. Specify locations and describe spatial relationships using coordinate geometry and other representational systems.

Before the Activity

  • Install the Cabri Jr. App on the students' graphing calculators using TI Connect™, a TI Connectivity Cable, and the Unit-to-Unit Link Cable
  • See the attached PDF file for detailed instructions for this activity
  • Print pages 44 - 45 from the attached PDF file for your class
  • During the Activity

    Distribute the pages to your class.

    Follow the Activity procedures:

  • Draw a line
  • Draw a line parallel to the original line
  • Draw a line perpendicular to the original line
  • Explore the relationships between the slopes of parallel and perpendicular lines
  • After the Activity

    Review student results:

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