Activity Overview
Use Cabri™ Jr. to discover what happens when we have two tangents from the same exterior point. After students investigate with Cabri Jr. they have a questions and a flow-proof to complete.
Before the Activity
Students need either a TI-83 plus or TI-84 with CabriJr. loaded. This is a free application that comes standard with the TI-84, but can also be loaded on the TI-83 plus if the operating system has been updated.
During the Activity
In this activity students will:
Draw a circle
Draw two tangent lines
Find the point of intersection
Measure the distances
Animate one of the tangents
After the Activity
Review student answers:
As a class, discuss questions that appeared to be more challenging
Re-teach concepts as necessary