Midsegment of a Trapezoid

Author

Texas Instruments

Alignment

Standards Alignment

Textbook Alignment

Subject Area

Math: Geometry: Quadrilaterals

Level

9-12

Activity Time

60 Minutes

Software

TI Connect™

TI Calculator

TI-83 Plus Family

TI-84 series

Applications

Cabri™ Jr. for TI-83 Plus and TI-84 Plus

Other Materials

This is Activity 11 from the EXPLORATIONS Book:
Exploring The Basics Of Geometry With Cabri

Resource Types

Lessons

Report an Issue

Midsegment of a Trapezoid

Activity Overview

Students study the Midsegment Theorem for Trapezoids.

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 45 - 47 from the attached PDF file for your class

During the Activity

Distribute the pages to the class.

Follow the Activity procedures:

Construct a segment AB

Construct a segment CD parallel to AB (not of the same measure)

Construct segments AD and BC to form a trapezoid ABCD

Drag point A so that AD is not parallel to BC

Construct a midsegment by joining the midpoints of segments AD and BC

Alter the trapezoid and check whether the midsegment is parallel to segments AB and CD

The midsegment is parallel to the two parallel sides of the trapezoid

Measure the lengths of AB, CD, and the midsegment

Observe that the length of the midsegment is half the sum of the lengths of AB and CD

Alter the trapezoid

Observe that for all trapezoids, the length of the midsegment is half the lengths of the two parallel sides

After the Activity

Review student results:

As a class, discuss questions that appeared to be more challenging

Re-teach concepts as necessary

Download Files

Download All Files (ZIP)

Before the Activity Files

Teacher Notes Appendix A PDF Teacher Notes Appendix B PDF Teacher Notes PDF

Author

Texas Instruments

Alignment

Standards Alignment

Textbook Alignment

Subject Area

Math: Geometry: Quadrilaterals

Level

9-12

Activity Time

60 Minutes

Software

TI Connect™

TI Calculator

TI-83 Plus Family

TI-84 series

Applications

Cabri™ Jr. for TI-83 Plus and TI-84 Plus

Other Materials

This is Activity 11 from the EXPLORATIONS Book:
Exploring The Basics Of Geometry With Cabri

Resource Types

Lessons

Report an Issue

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Midsegment of a Trapezoid

Cabri™ Jr. for TI-83 Plus and TI-84 Plus

Midsegment of a Trapezoid

Before the Activity Files

Cabri™ Jr. for TI-83 Plus and TI-84 Plus

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