Activity Overview
In this activity, students learn about the sum of the angles in a triangle. They understand triangles and their interior angles. 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 7-8 from the attached PDF file for your class
During the Activity
Distribute the pages to your class.
Follow the Activity procedures:
Draw a triangle using the Apps
Label the vertices of the triangle
Measure the interior angles of the triangle
Find the sum of the angles of the triangle
Move the vertex and measure the angles of the triangle and find the sum of its interior angles
TI-Navigator activity:
Use Screen Capture to identify problems with labeling
After the Activity
Review student results:
As a class, discuss questions that appeared to be more challenging
Re-teach concepts as necessary