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SOLUTION

The endpoints of RS are R (1, –3) and S (2, –6). Graph the image of RS after the composition. STEP 1. Graph RS. STEP 2. Reflect RS in the y -axis. R ′ S ′ has endpoints R ′(–1, –3) and S ′(–2, –6). EXAMPLE 2. Find the image of a composition. Reflection: in the y -axis.

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SOLUTION

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  1. The endpoints of RSare R(1, –3) and S(2, –6). Graph the image of RSafter the composition. STEP 1 Graph RS STEP 2 Reflect RSin the y-axis. R′S′ has endpoints R′(–1, –3) and S′(–2, –6). EXAMPLE 2 Find the image of a composition Reflection: in the y-axis Rotation: 90° about the origin SOLUTION

  2. EXAMPLE 2 Find the image of a composition o Rotate R′S′ 90 about the origin. R′′S′′ has endpoints R′′(3, –1) andS′′(6, –2). STEP 3

  3. In the diagram, a reflection in line kmaps GH to G′H′. A reflection in line m maps G′H′to G′′H′′. Also, HB = 9 andDH′′ = 4. a. Name any segments congruent to each segment: HG, HB, and GA ~ ~ ~ ~ a. HG H′G′ ,andHG H′′G′′. HB H′B. GA G′A . EXAMPLE 3 Use Theorem 9.5 SOLUTION

  4. In the diagram, a reflection in line kmaps GH to G′H′. A reflection in line m maps G′H′to G′′H′′. Also, HB = 9 andDH′′ = 4. b. Yes, AC = BDbecause GG′′ and HH′′ are perpendicular to both kand m,so BDand ACare opposite sides of a rectangle. EXAMPLE 3 Use Theorem 9.5 b. Does AC = BD? Explain. SOLUTION

  5. In the diagram, a reflection in line kmaps GH to G′H′. A reflection in line m maps G′H′to G′′H′′. Also, HB = 9 andDH′′ = 4. c.What is the length of GG′′ ? c. By the properties of reflections, H′B = 9 and H′D = 4. Theorem 9.5 implies that GG′′ = HH′′ = 2 BD, so the length of GG′′ is 2(9 + 4), or 26 units. EXAMPLE 3 Use Theorem 9.5 SOLUTION

  6. 3.Graph RSfrom Example 2. Do the rotation first, followed by the reflection. Does the order of the transformations matter? Explain. Yes; the resulting segment R′′ S ′′is not the same. for Examples 2 and 3 GUIDED PRACTICE SOLUTION

  7. for Examples 2 and 3 GUIDED PRACTICE 4.In Example 3, part (c), explain how you know that GG′′ = HH′′. SOLUTION They are opposite sides of a parallelogram.

  8. ANSWER 5. The preimage is reflected in line k , then in line m. Describe a single transformation that maps the blue figure to the green figure. Translation for Examples 2 and 3 GUIDED PRACTICE Use the figure below for Exercises 5 and 6. The distance between line k and line mis 1.6 centimeters.

  9. 6. What is the distance between Pand P′′? If you draw PP′ , what is its relationship with line k? Explain. ANSWER 3.2 cm; They are perpendicular. for Examples 2 and 3 GUIDED PRACTICE

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