Activity Overview
In this activity, students investigate what happens when all three medians of a triangle are drawn. They learn how to locate the centroid. 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 32 - 33 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 medians of the triangle
- Locate the centroid
- Explore measures of the segments in the triangle
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