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Translate, Rotate, Reflect!!!
Graph and describe translations and reflections of figures on a coordinate grid and determine the coordinates of the vertices of the figure after the transformation Use with the 11.6/11.7 Lesson Worksheet
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Translate, rotate, reflect
11.6/11.7 Notes Translate, rotate, reflect Same Signs = POSITIVE Opposite Signs = NEGATIVE βππ Γ· βπ = π ππ Γ· βπ =βπ
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I can⦠Self Assessment translate figures on a coordinate plane
rotate figures on a coordinate plane reflect figures on a coordinate plane Self Assessment 5- I can do it without help & teach others. 4- I can do this with no help, but I donβt know if I can explain it. 3- I can do this with a little help. 2- I can do this with a lot of help! 1- I donβt have a clue.
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Definitions Translation (Slide) Reflection (Flip) Rotation (Turn)
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Translation A translation is the movement of a figure without turning or reflecting! So, the figure moves in a direction. Any direction! But the figure does not turn!
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If the figure moves, but does not turn, we call that a translation!
Letβs Translate! However, be careful! Translations do not always happen in the direction that seems logical! Watch as the Circle TRANSLATES. The entire figure moves without turning! REMEMBER: If the figure moves, but does not turn, we call that a translation!
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Translating on a Graph Each point of the figure moves the SAME DISTANCE in the SAME DIRECTION in a Translation! Now... Translate the figure... β3 Units Downβ What is 3 units? Which direction is down? Pick some points! Weβll choose the four corners. Move each of those points down 3 units. Connect the dots to draw the translated figure. Check that your points have all moved 3 units!
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Translating on a Graph A (-5, 1)
If triangle ABC below is translated 6 units to the right and 3 units down, what are the coordinates of point D, E, & F. A (-5, 1) B (-1, 4) C (-2, 2) D = (1, -2) B E = (5, 1) A C E F = (4, -1) F D
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Now, Translate on Your Worksheet!
Problem #1 on your Worksheet Translate the shaded figure... 4 Units Up Click to check your answer! The red diamond is exactly 4 units above the shaded diamond! Each red brace is four units
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Reflection The Line of Reflection is exactly HALFWAY between the Original Figure and the Reflection! A reflection is when a figure is flipped across a pre-determined βline of reflectionβ! In a reflection, each point of the figure moves the same distance to the opposite side of the line of reflection. The more space between the figure and the line of reflection, the greater distance to the reflection. The part of the figure that is greatest distance from the line of reflection stays the greatest distance from the line of reflection. The closest part stays closest. Original Figure Line of Reflection Reflected Figure Original Figure Reflected Figure Line of Reflection Line of Reflection Reflected Figure
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Letβs Reflect! Remember...
The distance between the original figure and the Line of Reflection... Is the SAME as the distance between the reflected figure and the Line of Reflection. If the original figure is touching the Line of Reflection... The reflection will be touching the Line of Reflection! Reflections directly to the left or right of the original figure are also the same shape! Reflections directly above the figure and directly below the figure are the same shape! The part of the figure closest to the Line of Reflection will stay the closest part after the reflection. In this triangle, the longest side is the closest to the Line of Reflection. This is true in both the original figure, and the reflection.
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Guess the Reflection! Problem #2 On Your Worksheet
Guess the Reflection by drawing the Reflected Shape on your Paper! Problem #3 On Your Worksheet
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Reflecting on a Graph Each point on the figure is the same distance from the LINE OF REFLECTION. Now... Reflect the Figure... Across the Line of Reflection Find the Line of Reflection Measure the distance of a point from the Line of Reflection Draw a point that same distance, in the other direction from the line Repeat for more points Connect the dots! Line of Reflection
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Now, Reflect on Your Worksheet!
Problem #4 on your Worksheet Reflect the Figure Across the Dotted Line Find the Line of Reflection Measure the distance of a point on the edge of the figure, to the Line of Reflection Draw a point that same distance, in the other direction from the line Repeat for more points Connect the dots
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Draw the Line of Reflection!
Problem #7 on your Worksheet Problem #5 on your Worksheet You will see two figures. One is shaded, and one has dots. Draw the Line of Reflection! Remember, the Line of Reflection is the SAME DISTANCE from both figures! After you draw a line, measure to both figures to check your answer! Problem #8 on your Worksheet Problem #6 on your Worksheet
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Rotation In a Rotation, the Center Point stays in the same place, and every other part of the figure moves. The farther a point is from the center of the figure, the further it moves.
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Describing Rotations Clockwise
Rotations are most often described by the terms βClockwiseβ or βCounter-Clockwiseβ. Clockwise
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Describing Rotations Counter-Clockwise
Rotations are most often described by the terms βClockwiseβ or βCounter-Clockwiseβ. Counter-Clockwise
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Letβs Rotate! Quarter Rotation, Clockwise Quarter Rotation,
Counter-Clockwise Half-Rotation, Counter-Clockwise Half-Rotation, Clockwise
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Rotating on a Graph In a Rotation, the Center Point stays in the same place, and every other part of the figure moves. After rotating on a graph, make sure the edges of the figure are the same distance from the center point [to be sure the figure has not been stretched, shrunk, or reshaped]. In this case, the edges of the figures are 3 units from the center. 3 Units from center to edge 3 Units from center to edge Center Point
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Name the Transformation!
Problem #11 Problem #10 Problem #9 On Your Worksheet Figure A Name the Transformation that occurred between Figure A [The Original Figure] and Figure B [The Transformation]. Translation Reflection Rotation No Transformation Figure B
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I can⦠Self Assessment translate figures on a coordinate plane
rotate figures on a coordinate plane reflect figures on a coordinate plane Self Assessment 5- I can do it without help & teach others. 4- I can do this with no help, but I donβt know if I can explain it. 3- I can do this with a little help. 2- I can do this with a lot of help! 1- I donβt have a clue.
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