Activity Detail

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Circles in the Plane
 


Activity Overview

In this activity, students will use the Cabri™ Jr. application to explore circles in a plane. They will investigate the relationship between the equation of a circle, the length of its radius, and the coordinates of its center.

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 cables
  • See the attached PDF file for detailed instructions for this activity
  • Print pages 65 - 71 from the attached PDF file for your class


  • During the Activity

    Distribute the pages to your class.

    Follow the Activity procedures:
  • Show the coordinate axes and create a circle
  • Measure the radius of the circle, display the equation of the circle, and the coordinates of the center
  • Drag the circle, the center, and the radius point and observe the changes
  • Construct a point on the circle, and measure its distance to the center
  • Construct a point not on the circle, and measure its distance to the center
  • Examine the relationship between the coordinates of the center, the length of the radius, and the equation of the circle


    After the Activity

    Students will fill in the Data Collection and Analysis sheet.

    Review student results:
  • As a class, discuss questions that appeared to be more challenging
  • Re-teach concepts as necessary


    Other Downloads




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    Subject Area:
    Math : Geometry : Circles

    Author:
    Texas Instruments

    Level:
    9-12

    Activity Time:
    90 Minutes

    Device:
    TI-83 Plus Family, TI-84 Plus Family

    Apps:
    Cabri Geometry

    Software:
    TI Connect™

    Accessories:
    TI Connectivity Cable, Unit-to-Unit link cables

    Other:
    This is Activity 6 from the EXPLORATIONS Book:
    Exploring Mathematics with Cabri™ Jr. Application

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