Education Technology

Pearson Prentice Hall Geometry: Areas of Parallelograms and Triangles

Published on 04/18/2005

Activity Overview

Lesson 7-1: Areas of Parallelograms and Triangles is from Chapter 7: Area. Areas of a Triangle from the TI-83/84 Plus Activities book accompanies this lesson.
Students will find the area of a parallelogram and the area of a triangle.

Before the Activity

Review the lesson PDF files.
Make copies of the lesson PDF files for your class.
Using LearningCheck™ Creator review the LearningCheck EDC files prior to class. They include the Diagnosing Readiness,Check Skills You'll Need, and Check Understanding questions from the lesson.
Make sure LearningCheck and Cabri® Jr. are on all student calculators.
Transfer the LearningCheck EDC files to student calculators using one of these methods:

  • TI Connect™, a connectivity cable and unit-to-unit cables
  • TI-Navigator™ "send to class" feature

  • Transfer the Cabri Jr. files to student calculators using TI-Connect or the TI-Navigator System

    During the Activity

    Students will:

  • Find the area of a parallelogram
  • Find the area of a triangle
  • Explore the relationship between the base and height of the area of a triangle


  • Directions:
  • Distribute the student activity sheets
  • Follow the procedures as outlined
  • After the Activity

    As a class, review student answers, discussing questions that appeared to be more challenging, and re-teaching as needed.