Reflections Geometry Unit 7, Lesson 1 Mrs. King. BrainPop! yandmeasurement/transformation/previ ew.weml

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Presentation transcript:

Reflections Geometry Unit 7, Lesson 1 Mrs. King

BrainPop! yandmeasurement/transformation/previ ew.weml yandmeasurement/transformation/previ ew.weml

What is a Reflection? Definition: A flip. Example?

How to do a Reflection 1. Plot the point(s). 2. Count from the point to the line of reflection. 3. Count the same number of spaces in the opposite direction. 4. Plot the image.

Graphing Coordinates Plot the point A(4,6). Reflect the point (4,6) over the x-axis. Label this point A’ and state the coordinates. Reflect the point (4,6) over the y-axis. Label this point A” and state the coordinates. y x A A’ A” (4,-6) (-4,6)

Refresh Your Memory: Horizontal and Vertical Lines Graph the following lines: –Y=5 –Y=-2 –X=4 –X=-6 y x Y=5 Y=-2 X=4X=-6

Graphing Coordinates Plot the point A(4,6). Reflect the point (4,6) over the line x=-1. Label this point A’. Reflect the point (4,6) over the line y=2. Label this point A”. y x A A’ A” (-6,6) x=-1 y=2 (4,-2)

More Reflection Examples Graph the vertices of parallelogram WXYZ. –W(-3,5) –X(1,5) –Y(2,3) –Z(-2,3) Reflect the parallelogram over the x-axis. y x WX YZ W’ X’ Y’ Z’ W’(-3,-5) X’(1,-5) Y’(2,-3) Z’(-2,-3)

More Reflection Examples Graph the vertices of parallelogram WXYZ. –W(-3,1) –X(1,1) –Y(2,-1) –Z(-2,-1) Reflect the parallelogram over the line x=-2 y x WX YZ x=-2 W’X’ Y’ Z’ W’(-1,1) X’(-5,1) Y’(-6,-1) Z’(-2,-1)

Video Example

Practice with Line Reflections th/geometry/GT1/Prac1.htm th/geometry/GT1/Prac1.htm

More Practice: The image of the point (4,-3) under a reflection across the x-axis is… (4,3) The image of the point (-5,4) under a reflection across the y-axis is… (5,4)

Think about it: The image of the point (-1, 8) under a reflection across the line y = x is … (8, -1)