The Marching Cougars Lesson 9-1 Transformations
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1 The Marching Cougars Lesson 9-1 Learning Targets: Perform transformations on and off the coordinate plane. Identif characteristics of transformations that are rigid motions and characteristics of transformations that are non-rigid motions. Represent a transformation as a function using coordinates, and show how a figure is transformed b a function. SUGGESTED LEARNING STRATEGIES: Debriefing, Think-Pair-Share, Predict and Confirm, Self Revision/Peer Revision Mr. Scott directs the Marching Cougars, the band at Chavez High School. He uses the coordinate plane to represent the football field. For the band s first show, he arranges the band in a rectangle that is marchers wide and 9 marchers deep. M Notes DISCUSSION GROUP TIPS As ou work in groups, read the problem scenario carefull and eplore together the information provided. Discuss our understanding of the problem and ask peers or our teacher to clarif an areas that are not clear. 015 College Board. All rights reserved. The band begins b marching down the grid in this formation. Then the marchers move apart from each other verticall, while keeping the same distance between marchers within the same row. The diagrams on the net page show the initial shape of the marchers, and the two transformations that the undergo. To describe and classif the transformations, compare the pre-image of a transformation to its image. A Transformation 1 B Transformation C MATH TERMS A transformation is a change in the position, size, or shape of a figure. The pre-image of the transformation is the original figure. The image is the figure after the transformation. 1. Use our own words to describe Transformation 1. Activit 9 Translations, Reflections, and Rotations 3
2 M Notes. Compare Transformation 1 and Transformation. How do the two transformations compare? MATH TERMS A rigid motion is a transformation that preserves size and shape. 3. Model with mathematics. Transformation 1 is an eample of a rigid motion. A rigid motion keeps the same distance between the points that are transformed (in this situation, the marchers of the band); the shape and size of the pre-image and image are the same. a. How does Transformation 1 affect the distance between an two marchers in the band? b. How does Transformation affect the distance between the marchers? Is Transformation a rigid motion? TECHNOLOGY TIP You can also use geometr software to represent transformations, including rigid motions and non-rigid motions.. Review Transformation 1. Each point in the pre-image is mapped to a point in the image. For this reason, the transformation can be epressed as a function. a. Complete the table to show the positions of the four corners of the rectangle when Figure A is mapped onto Figure B. Figure A (pre-image) Figure B (image) (1, ) (1, ) (1, ) (, ) (, ) b. For an given point, how does the transformation change the -coordinate and -coordinate? 015 College Board. All rights reserved. READING IN MATH The arrow ( ) in the notation that shows how a point is transformed means goes to. c. You can use the notation (1, ) (1, ) to show how a point is transformed. When ou use this notation to show how a general point (, ) is transformed, ou are epressing the transformation as a function. Epress Transformation 1 as a function. SpringBoard Mathematics Geometr, Unit, Triangles, and Quadrilaterals
3 5. Review Transformation. a. Complete the table to show the positions of the four corners of the rectangle when Figure B is mapped onto Figure C. M Notes CONNECT TO ALGEBRA Figure B (pre-image) Figure C (image) (1, ) (1, ) (1, ) You ve used functions etensivel in algebra. Recall that a function is a set of ordered pairs in which each -value is associated with one, and onl one, -value. b. For an given point, how does the transformation change the -coordinate and -coordinate? c. Can Transformation also be epressed as a function? Eplain wh or wh not. Write the function if it eists.. Draw each image on the graph to show how the pre-image is transformed b the function. Then classif the transformation as rigid or non-rigid. a. (, ) ( + 3, ) DISCUSSION GROUP TIPS As ou read and discuss the transformations, ask and answer questions to be sure ou have a clear understanding of not onl all the terminolog used, but also the link between the algebraic notation and the graphs. 015 College Board. All rights reserved. b. (, ) (, ) 7. Write the numeral in the middle of each pre-image in Item. Describe how the numeral should appear in each image. Activit 9 Translations, Reflections, and Rotations 5
4 M Notes Check Your Understanding Use the tet and diagram to answer Items and 9. The rectangle undergoes the transformation described b the function (, ) (, +1).. Complete the table to show the coordinates of the image and pre-image for the four corners of the rectangle. Pre-image Image (1, 3) (1, 7) MATH TIP A rigid motion can be modeled b sliding, rotating, or flipping a figure. A non-rigid motion often involves stretching or compressing the figure. 9. Graph the transformation of the figure. Is the transformation a rigid motion or non-rigid motion? Eplain how ou know.. A rectangle is transformed as shown. 015 College Board. All rights reserved. SpringBoard Mathematics Geometr, Unit, Triangles, and Quadrilaterals
5 a. Which function describes the transformation? b. Classif the transformation as rigid or non-rigid. Eplain wh ou classified the transformation that wa. M Notes For Items 11 and 1, consider the following: A rectangle undergoes the transformation described b the function (, ),. MATH TIP Man different transformations can transform a pre-image to the same image. Consider sliding, flipping, and turning. 015 College Board. All rights reserved. 11. Graph the transformation of the figure. Is the transformation a rigid motion? Eplain. 1. Reason abstractl. Draw a plus sign (+) in the middle of the image. Describe how the transformation would change the plus sign. 13. Attend to precision. Use the graph of the rectangle to help ou classif each of the following transformations. a. Draw the image of the rectangle under the transformation described b the function (, ) (, ). Classif the transformation as rigid or non-rigid. b. Draw the image of the rectangle under the transformation described b the function (, ) (, + ). Classif the transformation as rigid or non-rigid. Activit 9 Translations, Reflections, and Rotations 7
Translations, Reflections, and Rotations
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