Attendance Problems. 1. Sketch a right angle and its angle bisector.

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1 Page 1 of 10 ttendance Problems. 1. Sketch a right angle and its angle bisector. 2. Draw three different squares with (3, 2) as one verte. 3. Find the values of and y if (3, 2) = ( + 1, y 3) Vocabulary transformation reflection preimage rotation image translation I can identify reflections, rotations, and translations. I can graph transformations in the coordinate plane. Common Core CC.9-12.G.CO. Develop definitions of rotations, reflections, and translations in terms of angles, circles, perpendicular lines, parallel lines, and line segments. CC.9-12.G.CO.2 Represent transformations in the plane using. CC.9-12.G.CO.5 Given a geometric figure and a rotation, reflection, or translation, draw the transformed figure Specify a sequence of transformations that will carry a given figure onto another.

2 Page 2 of 10 The lhambra, a 13th-century palace in Grenada, Spain, is famous for the geometric patterns that cover its walls and floors. To create a variety of designs, the builders based the patterns on several different transformations.. What is a transformation? 5. In a transformation, what is the original image called? 6. In a transformation, what is the new image called? 7. What is the notation used to show a transformation? 8. How do you label the point of the transformed image?

3 Page 3 of 10 Video Eample 1. Identify the transformation. Then use arrow notation to describe the transformation.. B. 1 Identifying Transformations Identify the transformation. Then use arrow notation to describe the transformation. F E G G E The transformation is a reflection. EFG E F G F The transformation cannot be a translation because each point and its image are not in the same position.

4 Page of 10 Identify the transformation. Then use arrow notation to describe the transformation. B T S The transformation cannot be a reflection because each point and its image are not the same distance from a line of reflection. U R U T R S The transformation is a 90 rotation. RSTU R S T U Eample 1. Identify the transformation. Then use arrow notation to describe the transformation.. B.

5 Page 5 of 10 Guided Practice. Identify the transformation. Then use arrow notation to describe the transformation Video Eample 2. figure has vertices at (2, ), B(, -1), and C(2, -1). fter a transformation, the image of the figure has vertices at (-2, ), B (-, -1), and C (-2, -1). Draw the preimage and the image. Then identify the transformation. 2 Drawing and Identifying Transformations figure has vertices at (-1, ), B (-1, 1), and C (3, 1). fter a transformation, the image of the figure has vertices at (-1, -), B (-1, -1), and C (3, -1). Draw the preimage and image. Then identify the transformation. Plot the points. Then use a straightedge to connect the vertices. The transformation is a reflection across the -ais because each point and its image are the same distance from the -ais. - 2 B B -2 y C C

6 Page 6 of 10 Eample 2. figure has vertices at (1, 1), B(2, 3), and C(, 2). fter a transformation, the image of the figure has vertices at '( 1, 1), B'( 2, 3), and C'(, 2). Draw the preimage and image. Then identify the transformation. 11. Guided Practice: figure has vertices at E(2, 0), F(2, -1), G(5, -1), and H(5, 0). fter a transformation, the image of the figure has vertices at E (0, 2), F (1, 2), G (1, 5), and H (0, 5). Draw the preimage and image. Then identify the transformation. To find coordinates for the image of a figure in a translation, add a to the -coordinates of the preimage and add b to the y-coordinates of the preimage. Translations can also be described by a rule such as,y ( ) ( + a,y + b). Video Eample 3. Find the coordinates for the image of BC after the translation (,y) ( 3, y + 2). Draw the image.

7 To find coordinates for the image of a figure in a translation, add a to the -coordinates of the preimage and add b to the y-coordinates of the preimage. Geometry can 1-7 Study Guide: Transformations the as Coordinate Translations also be described by a rule in such a, y50-52) + b). ( + (pp (, y) Plane Page 7 of 10 MPLE 3 Translations in the Coordinate Plane Find the coordinates for the image of "BC after the translation (, y) ( + 3, y - ). Draw the image. Step 1 Find the coordinates of #BC. The vertices of #BC are (-1, 1), B(-3, 3), and C(-, 0). B C - 0 y - Step 2 pply the rule to find the vertices y 1-7 Transformations in the Coordinate Plane 51 B of the image.!(-1 + 3, 1 - ) =!(2, -3) B!(-3 + 3, 3 - ) = B!(0, -1) C 0 B! - C!(- + 3, 0 - ) = C!(-1, -) 2/18/11 Step 3 Plot the points. Then finish drawing the image by using a straightedge to connect the vertices.! C! Eample 3. Find the coordinates for the image of BC after the translation y 3. Find the coordinates for the image Drawafter the image. (, y) + 2, y 1of.JKLM the translation (, y) ( - 2, y + ). Draw the image. J ( 11:39:33 M ) K MPLE M L rt History pplication y The pattern shown is similar to a pattern on a wall of the lhambra. Write a rule for the translation of square 1 to square 2. Step 1 Choose 2 points Choose a point on the preimage and a corresponding point! on the image. has coordinates (3, 1), and! has coordinates (1, 3). Step 2 Translate To translate to!, 2 units are subtracted from the -coordinate and 2 1 3

8 Page 8 of Guided Practice: Find the coordinates for the image of JKLM after the translation,y ( ) ( 2,y + ). Draw the image. Video Eample. The pattern shown is similar to a pattern on a wall of the lhambra. Write a rule for the translation of square to square 2. rt History pplication The pattern shown is similar to a pattern on a wall of the lhambra. Write a rule for the translation of square 1 to square 2. Step 1 Choose 2 points Choose a point on the preimage and a corresponding point on the image. has coordinates (3, 1), and has coordinates (1, 3). 3 y 2 1 Step 2 Translate To translate to, 2 units are subtracted from the -coordinate and 2 units are added to the y-coordinate. Therefore, the translation rule is (, y) ( - 2, y + 2).

9 Page 9 of 10 Eample. The figure shows part of a tile floor. Write a rule for the translation of heagon 1 to heagon Guided Practice: Use the diagram to write a rule for the translation of square 1 to square ssignment (pp 53-55) 8, 10-12, 1, 18, 2, Geometry Ready to Go On Section 1b Pre-Test

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