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Symmetry - PowerPoint PPT Presentation


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Symmetry. Rotation. Irma Crespo 2010. Warm Up. http://www.haelmedia.com/OnlineActivities_txh/mc_txh4_001.html. Irma Crespo 2010. Fast Fact on Rotation. 90 º. 0 º. counterclockwise. 180 º. 270 º. Fast Fact on Rotation. 90 º. 180 º. clockwise. 0 º. 270 º. 90 º. 180 º. 0 º.

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symmetry

Symmetry

Rotation

Irma Crespo 2010

slide2

Warm Up

http://www.haelmedia.com/OnlineActivities_txh/mc_txh4_001.html

Irma Crespo 2010

fast fact on rotation
Fast Fact on Rotation

90º

counterclockwise

180º

270º

fast fact on rotation1
Fast Fact on Rotation

90º

180º

clockwise

270º

rotational symmetry

90º

180º

Rotational Symmetry
  • A figure has rotational symmetry if it can be rotated or turned less than 360º about its center so the figure looks exactly as it does in its original position.

rotational symmetry at 180º

rotational symmetry1
Rotational Symmetry
  • Simply means, if you turn a figure around before a complete turn (360º) and it looks exactly the same, then, it has rotational symmetry.

180º turn

original position

90º turn

rotational symmetry at 180º

use of symmetry
Use of Symmetry

http://www.teachers.ash.org.au/mikemath/movies/symmetry1.html

slide10

Summary

  • When an image is turned less than 360º and it looks exactly the same as it was when it was in its original position, there is rotational symmetry.
  • We learned two kinds of symmetry: line symmetry and rotational symmetry.
slide11

Exit Slip

  • Explain rotational symmetry. If you wish, you can differentiate it with line symmetry.
  • Your explanation has to be in complete sentences.
  • This is a one-point extra credit.
slide12

Complete the practice worksheet.

Skills Practice: Lesson 6-5, Page 33/36

Work with a partner or on your own.

Submit completed worksheet for grading.

Solutions are discussed the next day.

Practice Worksheet

slide13

PowerPoint created by Irma Crespo. University of Michigan-Dearborn, School of Education. Winter 2010.