## DANCE THE DEPENDENT VARIABLE—GEOMETRIC FUNCTION DANCES

Grades: 7‒11

In Geometric Functions activities students create, manipulate, and experience function concepts by treating geometric transformations as functions with points as their variables.

In this two-part activity, students perform dances based on the translation, reflection, rotation, and dilation function families. In part 1, teams of students practice and perform physical dances with one student as the independent variable, another as the dependent variable, and the remaining students as choreographers. In part 2, pairs of students use Sketchpad to perform virtual dances, with one student moving the dependent variable and the other student acting as coach and recorder.

OBJECTIVES

In this activity students will:

• Work with a team to practice and then perform several function dances chosen from the reflection, rotation, dilation, and translation families.
• Dance the role of an independent variable either by moving freely or by moving along a restricted domain.
• Dance the role of a dependent variable, moving in coordination with the independent dancer to maintain the function rule.
• Coach the independent and dependent dancers to help them maintain the function rule.
• Drag a point to keep it in the role of dependent variable for an animated independent variable.
• Observe, analyze, and record the relative rate of change of the two point variables.
• Compare the shapes traced by an independent variable restricted to a domain and a corresponding dependent variable, distinguishing between similar shapes and congruent shapes.

COMMON CORE CONNECTIONS
Mathematical Practices

(1) Make sense of problems and persevere in solving them; (2) Reason abstractly and quantitatively; (3) Construct viable arguments and critique the reasoning of others; (4) Model with mathematics; (5) Use appropriate tools strategically; (6) Attend to precision; (7) Look for and make use of structure; (8) Look for and express regularity in repeated reasoning.

Content Standards

8.F1,2; 8.G1; F-IF1,2,9; G-CO2; G-SRT1

This activity is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License: http://creativecommons.org/licenses/by-nc-sa/3.0/. If you adapt and/or share this activity, you must attribute it to "KCP Technologies, a McGraw-Hill Education Company." You may distribute it only non-commercially under the same or similar license.

This material is based upon work supported by the National Science Foundation under KCP Technologies Award ID 0918733, with grant period September 1, 2009 through August 31, 2013. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.
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