Activity Detail
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Activity Overview

In this activity, students use the Geoboard to determine the areas of quadrilaterals between parallel lines.

Before the Activity

  • Start the Geoboard App and format it
  • See the attached PDF file for detailed instructions for this activity
  • Print pages 37 - 46 from the attached PDF file for your class

    		•

    		During the Activity

    		Distribute the page to the class.

    Follow the Activity procedures:
  • Construct two parallel line segments, with a distance of 5 units between them
  • Between these two parallel lines build three different parallelograms with the same base of 1 unit and same height of 5 units
  • Calculate the area of the parallelograms, and observe that it is the same as the area of a rectangle with the same height and base (5 square units)


  • Draw three trapezoids between the parallel lines that have the same bottom base length of 2 units, top base length of 1 unit and height 5 units
  • Calculate the area of the trapezoids
  • Note the area of trapezoids is equal to 7.5 square units
  • Observe that the area of quadrilaterals between parallel lines with same base and height area equal

    		After the Activity

    		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 : Quadrilaterals

    Author:
    Texas Instruments

    Level:
    5-8

    Activity Time:
    60 Minutes

    Device:
    TI-73 Explorer™

    Apps:
     

    Software:
     

    Accessories:
     

    Other:
    This is Activity 4 from the EXPLORATIONS Book:
    Shaping Middle Grades Mathematics: Activities for Geoboard and the TI-73



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