Education Technology

• ##### Device
• TI-Nspire™ CX/CX II
• TI-Nspire™ CX CAS/CX II CAS
• TI-Nspire™
• TI-Nspire™ CAS
• ##### Software

TI-Nspire™
TI-Nspire™ CAS

3.0

# Geometry: Transformations With Lists

by Texas Instruments

#### Overview

Students use list operations to perform reflections, rotations, translations and dilations on a figure, and graph the resulting image using a scatter plot.

#### Key Steps

• Students use the Lists & Spreadsheets app to enter values that gives the x- and y-values for a figure that is being rotated and reflected about the y-axis.

They enter = –list1 and = –list2 in the formula bar of Column C to create list3, the opposite of each of the x-values in list1. Then do a similar process for the y-values in list2.

• Students create a scatter plot with connected points using the combinations of lists. For each combination, students determine what type of reflection or rotation occurred.

• Problem 3 allows students to translate a figure by manipulating formulas to translate the x- and y-values.