Activity Detail
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Isosceles Triangle
 


Activity Overview

In this activity, students construct isosceles and equilateral triangles. They discover that if two sides of a triangle are congruent, then the angles opposite them are congruent. They understand that an equilateral triangle is also equiangular.

Before the Activity

Install the Cabri™: Jr. App on the students' graphing calculators using one of these two methods:
  • TI-Connect™,  a TI Connectivity Cable, and the Unit-to-Unit Link Cable
  • TI-Navigator™  "send to class" feature
  • See the attached PDF file for detailed instructions for this activity
  • Print pages 15 - 16 from the attached PDF file for your class

    		•

    		During the Activity

    		Distribute the pages to the class.

    Follow the Activity procedures:
  • Construct an isosceles triangle
  • Measure and label segments and angles of the triangle
  • Identify the sides and angles that are congruent
  • Verify this relationship with different isosceles triangles
  • Observe that if two sides of a triangle are congruent, then the angles opposite them are congruent
  • Create an equilateral triangle using the Regular Polygon feature
  • Measure the angles
  • Observe that if all sides of a triangle are equal, then the triangle is equiangular
  • Alter the triangle and verify if the relationship holds true for all equilateral triangles

    		After the Activity

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

    		Other Downloads




    view standards alignment
    view textbook alignment

    Subject Area:
    Math : Geometry : Triangles

    Author:
    Texas Instruments

    Level:
    9-12

    Activity Time:
    60 Minutes

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

    Apps:
    Cabri™ Jr.

    Software:
    Cabri Geometry™, TI Connect™

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

    Other:
    This is Activity 4 from the EXPLORATIONS Book:
    Exploring The Basics Of Geometry With Cabri



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