Education Technology

# Points in the Coordinate Plane

Math: PreAlgebra: Geometry
9-12
90 Minutes
TI Connect™
TI-83 Plus Family
TI-84 Plus
TI-84 Plus Silver Edition
This is Activity 5 from the EXPLORATIONS Book:
Exploring Mathematics with Cabri™ Jr. Application
Lessons

# Points in the Coordinate Plane

Activity Overview

In this activity, students will use the Cabri™ Jr. Application to explore the coordinate system.

Before the Activity

• Install the Cabri Jr. App on the students' graphing calculators using TI Connect™, a TI Connectivity cable and the unit-to-unit link cables
• See the attached PDF file for detailed instructions for this activity
• Print pages 55 - 62 from the attached PDF file for your class
• During the Activity

Distribute the pages to your class.

• Show the coordinate axes, and create a point in the first quadrant
• Display the coordinates of the point
• Drag the point to all four quadrants and observe changes in the coordinates
• Construct lines through the point perpendicular to the axes
• Hide the perpendiculars and measure the length of the point from the x-axis and the y-axis
• Drag the point to all four quadrants and observe the changes in the measured distance
• After the Activity

Students will fill in the Data Collection and Analysis sheet.

Review student results:

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