Activity Overview
Students use the drawing and measurement tools of Cabri™ Jr. to draw a line tangent to a circle. 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
See the attached PDF file for detailed instructions for this activity
Print page 40 from the attached PDF file for your class
During the Activity
Distribute the page to your class.
Follow the Activity procedures:
Draw a circle
Draw a radius of the circle
Construct a line perpendicular to the radius at its endpoint
This will be a tangent line
Change the size of the circle and observe the tangent
After the Activity
Review student results:
As a class, discuss questions that appeared to be more challenging
Re-teach concepts as necessary