Education Technology

# Activities

• ##### Subject Area

• Math: PreAlgebra: Geometry

9-12

60 Minutes

• ##### Device
• TI-83 Plus Family
• TI-84 Plus
• TI-84 Plus Silver Edition
• ##### Software

Cabri Geometry™
TI Connect™

• ##### Accessories

TI Connectivity Cable

• ##### Other Materials
This is Activity 17 from the EXPLORATIONS Book:
Exploring The Basics Of Geometry With Cabri

## Perimeter and Area of a Square

#### Activity Overview

Students study the perimeter and area of a square, and explore the relationship between them and the length of the side of the square.

#### 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 69 - 70 from the attached PDF file for your class
• #### During the Activity

Distribute the pages to the class.

• Use the Regular Polygon feature on the calculator to construct a square
• Measure and record the length of one side of the square
• Measure the perimeter and area of the square
• Alter the square until its side length is 1 cm and record the values of perimeter and area in a table
• Record the side length, perimeter, and area of squares with side lengths of 2, 3, 4, 5, and 6cm
• Observe that the perimeter of a square increases by 4 units as the length of the side increases by 1 unit
• Compare the first six perfect square numbers to the numbers in the Area column
• Observe that the area of a square is always a perfect square number
• #### After the Activity

Review student results:

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