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Lisa Dempsey

 

TeachNet NYC: Lesson Plans

Triangle Exploration

Project URL:
http://teachers.ithsnyc.org/landerson/
area/frontpage/frontpage.htm

How it works:
Triangle Exploration is an introductory lesson for both teacher and student on how to use The Geometer's Sketchpad software, a visualization environment that covers a broad range of the mathematics curriculum. The software is easy to get accustomed to, and this unit provides plenty of screenshots and step-by-step instructions. As the title to this project implies, the focus here is on triangles. A horizontal line is drawn first. Next a parallel line, then a base on the lower parallel line. Two triangles are drawn with the vertex on the top parallel line. The area of both triangles is found and an analysis of the their area follows. 

Standards addressed:  
Students understand the basic properties of horizontal and parallel lines, and the area of a triangle. They use geometry to complete basic geometric constructions. 

Materials used:
Required materials include a computer with Internet Access and The Geometer's Sketchpad software. A free trial version may be downloaded from this site: http://keypress.com/sketchpad/

The students:
Students of many levels will find this lesson beneficial. A student who does not understand basic geometric concepts will learn, as will a strong math student who is not familiar with the Sketchpad software. 

Overall value:
Triangle Exploration is a great program for both teachers and students to learn how to use Sketchpad software, which offers insights into much of the mathematics curriculum.

Tips: 
Try the lessons before presenting them to the class. Make sure the computers are student-ready with working Internet connection and applications before engaging students. 


About the teacher:
Laura Anderson has been teaching for 20 years. She currently teaches Web Design, Mathematics, and Computer Programming at Edward A. Reynolds West Side High School in New York City. 

E-mail: 
LauraJaneAnders@aol.com

Subject Areas:  
Math
Technology                    

Grade Levels: 
6-12

 

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