Activity Overview
In this activity, students use the Cabri™ Jr. tools to draw altitudes in a triangle. They construct a line perpendicular to a given line and through a given point. NCTM Geometry Standard covered: Analyze characteristics and properties of 2- and 3-dimensional geometric shapes and develop mathematical arguments about geometric relationships.
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
Set up the
TI-Navigator™ system
See the attached PDF file for detailed instructions for this activity
Print pages 19-20 from the attached PDF file for your class
During the Activity
Distribute the pages to your class.
Follow the Activity procedures:
- Draw a triangle
- Draw the altitudes of the triangle
- Locate the orthocenter
- Explore properties of the orthocenter
TI-Navigator activity:
- Use Screen Capture to observe and assess individual progress in drawing and exploring
After the Activity
Review student results:
As a class, discuss questions that appeared to be more challenging
Re-teach concepts as necessary