Education Technology

Tangents from the same exterior point with CABRI JR.

Subject Area
Math: Geometry: Circles
Level
9-12
Activity Time
30 Minutes
TI Calculator
TI-84 series
Resource Types
Lessons

Tangents from the same exterior point with CABRI JR.

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
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    Subject Area
    Math: Geometry: Circles
    Level
    9-12
    Activity Time
    30 Minutes
    TI Calculator
    TI-84 series
    Resource Types
    Lessons
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