Education Technology

NY State Geometry Standard G.G.32 - Exterior angles of a triangle.

Activity Overview

Students will explore the relationship between an exterior angle and the remote interior angles of a triangle using a CABRI Jr. file to drag various parts of a triangle. The corresponding worksheet can be tailored to fit a variety of class formats.

Before the Activity

  1. Download the Cabri Jr. APPVAR EXTTRI to handhelds using TI-Connect software and unit to unit link cables. EXTTRI may also be sent via TI-Navigator
  2. Students should do the worksheet "Selecting and dragging an object using Cabri Jr."

During the Activity

This activity is a lesson launcher for exterior angles of a triangle.

  1. Distribute Student Worksheet for Exterior angles of a triangle.
  2. Students use the Cabri Jr. APPVAR EXTTRI to answer questions from student worksheet.

After the Activity

Review student results from worksheet.