Activity Overview
In this activity, students develop an understanding of the circumcenter of a triangle. Students construct perpendicular bisectors of three sides of a triangle and find the circumcenter.
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 17-18 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 perpendicular bisector of each side of the triangle
Find the circumcenter, which is the point where all the bisectors intersect
Explore properties of the circumcenter
TI-Navigator activity:
Save this file as an APP VAR for later exploration and investigation. (Activity 13)
After the Activity
Review student results:
As a class, discuss questions that appeared to be more challenging
Re-teach concepts as necessary