Chapter 12 Transformations: Shapes in Motion
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1 Name Geometry Honors Date Per. Teacher Chapter 12 Transformations: Shapes in Motion 1
2 Table of Contents Reflections Day Page 3 Translations Day Page 10 Rotations/Dilations Day Page 17 Symmetry Day Page 26 Glide Reflections Day 5... Page 31 Compositions Day Page 37 Review Day Page 40 2
3 Reflections Day 1 An Introduction to Transformations Reflections 3
4 Reflection Over the X-Axis Graph line segment PQ with vertices P(-3, 4) and Q(4, 2). Then graph the image of line segment PQ after a reflection over the x-axis. Write the coordinates of its vertices. P(-3, 4) Q(4, 2) P l Q l Rule 4
5 Reflection Over the Y-Axis Graph line segment AB with vertices A(-4, 1) and B(-2, 3). Then graph the image of line segment AB after a reflection over the y-axis. Write the coordinates of its vertices. A(-4, 1) B(-2, 3) A l B l Rule Reflection Over the line y = x. Graph line segment CD with vertices C(0, 3), and D(-3, -2). Then graph the image of CD after a reflection over the line y = x. Write the coordinates of the new vertices. C(0, 3) D(-3, -2) C l D l Rule 5
6 Reflection Over the line y = -x. Graph line segment CD with vertices C(0, 3), and D(-3, -2). Then graph the image of CD after a reflection over the line y = -x. Write the coordinates of the new vertices. C(0, 3) D(-3, -2) C l D l Rule Reflection over a Horizontal or Vertical Line Graph the point A with vertices A(1, 2). Then graph the image of A after a reflection over the line y = -1. Write the coordinates of the new vertices. A(1, 2) A l Rule 6
7 Identifying a Reflection Write a rule to describe each transformation. a. b. Summary 7
8 Homework 8
9 9
10 Translations Day 2 Warm - Up
11 11
12 1) Triangle DEF is a translation of triangle ABC. Use the diagram to write a rule for the translation of triangle ABC to Triangle DEF. 2) Pentagon ABCDE is drawn on the grid below. On the grid, draw a translation of pentagon ABCDE using the rule T 3,-5. 12
13 3) Pentagon ABCDE is plotted on the grid below. On the grid, draw the translation of pentagon ABCDE using the rule T- 4,3. Label the translated figure A B C D E
14 Summary 14
15 Homework 15
16 16
17 Rotations and Dilations Day 3 Warm - Up
18 Example 1: Graph triangle XYZ with vertices X(2, 2), Y(4, 3), and Z(3, 0). Then graph the image of triangle XYZ after a rotation 90 o counterclockwise about the origin, and write the coordinates of its vertices. X(2, 2) X l (, ) Y(4, 3) Y l (, ) Z(3, 0) Z l (, ) 18
19 Example 2: Graph trapezoid ABCD with vertices A(1, 3), B(4, 4), C(4, 0), and D(1, 1). Then graph the image of trapezoid ABCD after a 180 o rotation about the origin, and write the coordinates of its vertices. A(1, 3) A l (, ) B(4, 4) B l (, ) C(4, 0) C l (, ) D(1, 1) D l (, ) Example 3: Graph polygon TUVW with vertices T(2, -4), U(3, -1), V(-1, 0), and W(-2, -3). Then graph the image of polygon TUVW after a 270 o rotation, and write the coordinates of its vertices. T(2, -4) T l (, ) U(3, -1) U l (, ) V(-1, 0) V l (, ) W(-2, -3) W l (, ) Identifying a Rotation Write a rule to describe each transformation. a. gfgf b. 19
20 Dilation 20
21 Example 1-Enlargement Graph triangle PQR with vertices P(-1, 1), Q(4, 1), and R(-1, 3). Then Graph its image triangle P Q R after a dilation with a scale factor of 2. P(-1, 1) Q(4, 1) R(-1, 3) P Q R Example 2-Reduciton Graph quadrilateral EFGH with vertices E(-6, 4), F(-4, 8), G(4, 2), and H(-2, -4). Then graph the image of EFGH after a dilation with a scale factor of ½. E(-6, 4) F(-4, 8) G(4, 2) H(-2, -4) E F G H Example 3-Determining the Scale Factor Graph triangle ABC with vertices A(-4, 6), B(-2, 4), and C(-8, 4). Then graph the image of ABC after a dilation triangle A B C with vertices A l (-2, 3), B l (-1, 2), and C l (-4, 2). Find the scale factor of the dilation and classify as an enlargement or a reduction. 21
22 Summary 22
23 Homework rotation 270 counterclockwise about the origin. 23
24 24
25 Dilations 25
26 Symmetry Day 4 Warm - up
27 27
28 28
29 Homework 29
30 30
31 Glide Reflections Day 5 Warm Up Which rotation about point O maps B to D? 31
32 The symbol for a composition of transformations is an open circle. The notation is read as a reflection in the x-axis following a translation of (x+3, y+4). Be careful!!! The process is done in reverse!! You may see various notations which represent a composition of transformations: could also be indicated by Identifying Glide Reflections 1. 32
33 1) 2) Is T 0, 5 r y-axis a glide reflection? 3) Is T 7, 0 r x-axis a glide reflection? 4) Is T 3,3 r y=x a glide reflection? 6) Is T 4,-1 r y-axis a glide reflection? 7) Is T -2, 8 r x-axis a glide reflection? Practice Problem #8 33
34 Practice Problem #9 Given: ABC: A (-4, 5), B (-6, 7), C (-8, 3) A (, ) B (, ) C (, ) Practice Problem #10 Given: ABC: A (5, 1), B (7, 4), C (9, 1) T -5,-4 r x-axis A (, ) B (, ) C (, ) 34
35 Homework 35
36 A (, ) and B (, ) A (, ) B (, ) C (, ) A (, ) B (, ) C (, ) 36
37 Compositions (More Practice) Day 6 When two or more transformations are combined to form a new transformation, the result is called a composition of transformations. In a composition, the first transformation produces an image upon which the second transformation is then performed. The symbol for a composition of transformations is an open circle. The notation is read as a reflection in the x-axis following a translation of (x+3, y+4). Be careful!!! The process is done in reverse!! 37
38 38
39 Try it Problems 1. The transformation (x, y) (2x + 4, 2y + 1) is the composition of what two transformations?
40 Homework: Transformations Review 1) In the accompanying diagram, K is the image of A after a translation. Under the same translation, which point is the image of J? 2) A translation moves A (-1, 3) to A (-3, 7). What are the coordinates of B, the image of B(5,-3) under the same translation? 3) Find the coordinates of P, the image of P (-3, 4) under the translation T 4,1. 4) Translation T maps point (2, 6) to point (4, -1). What is the image of point (-1, 3) under translation T? 5) Which graph shows a reflection ABC in the x-axis? 6) 40
41 7) Find the coordinates of P, the image of P(3, -1) under the transformations (x,y) (-y, -x). 8) What is the image of (6, 5) under a counterclockwise rotation of 180? 9) If point P (3, -2) is rotated 90 about the origin, what is the image of P? 10) Which transformation does not preserve size? 11) The image of (-2, 6) after a dilation with respect to the origin is (-10, 30). What is the constant of dilation? 12) Which transformation for letter M is shown in the accompanying diagram? 13) If a dilation maps (-3, 2) to (x, 8), what is the value of x? 14) If the coordinates of point A are ( 2,3), what is the image of A under r y axis D? 3 41
42 15) On the accompanying grid, graph and label AB, where A is (0,5) and B is (2,0). Under the transformation rx axis ry axis (AB), A maps to A, and B maps to B. Graph and label A B. What single transformation would map AB to A B? 42
43 In 16-21: a. Find the image of P(5, -3) under each of the given transformations. 16. r x-axis 17. R R T 0,3 20. r x-axis T 2,2 21. r x-axis r y=x
44 23. 44
45 Compositions: 45
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