Algebra
Lesson 4-2
Vocabulary:
Transformations-are movements of geometric figures
Preimage-is the position of the figure before the transformation
Image-is the position of the figure after the transformation
Reflection-a figure flipped over a line
Translation-a figure is slid in any direction
Dilation-a figure is enlarged or reduced
Rotation-a figure is turned around a point
Examples:
This triangle is Triangle ABC. A(-6,9)B(3,7)C(0,2) I am now going to reflect it over the X axis. The triangle is now Triangle A(-6,-9)B(-3,-7)C(0,-2). *The pink
triangle is the preimage and the purple triangle is the image. Got it? :)
Additional Information:
Did you know?
This lesson is teaching us a little bit about computers. It teaches us a little about digital photography, like
enlarging a photograph on the computer.
Online resources: http://argyll.epsb.ca/jreed/math7/strand3/3301.htm http://www.dean.tec.ma.us/MCAS/mcas-tcp.htm
http://www.edhelper.com/math/coordinate_graphing491.htm Take the quiz and see how you do. http://en.wikipedia.org/wiki/Coordinates_%28elementary_mathematics%29 This is how they describe it on wikipedia http://www.shodor.org/interactivate/activities/Transmographer/? version=1.5.0_08&browser=Mozilla&vendor=Sun_Microsystems_Inc. http://www.glencoe.com/sec/math/algebra/algebra1/algebra1_03/study_guide/pdfs/alg1_pssg_G030.pdf
Pictures:
Problems to try:Go to this Website http://www.glencoe.com/sec/math/prealg/prealg03/study_guide/pdfs/prealg_pssg_G083.pdf
This page by:
Andrew M., Craig H. And Anna R. :)
Thank you for checking our section out... I'm pretty sure it will help on the test! And if you still have any questions, I'm sure Mr. Brandl wouldn't mind answering them..