Chapter 9.2 Reflections GEOM 22.0 Students know the effect of rigid motions on figures in the coordinate plane and space, including reflections.

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Presentation transcript:

Chapter 9.2 Reflections GEOM 22.0 Students know the effect of rigid motions on figures in the coordinate plane and space, including reflections

Vocabulary Reflection (Flip!!) : is an isometry in which a figure and its image have opposites orientations. Thus, a reflected image in a mirror appears “backward”

Vocabulary Line of Reflection (Mirror line) – the line which the object is flipped about

Example of Line of Reflection and labeling of transformation Line of reflection/Mirror line

Line of Reflection: X-axis X-Axis If the mirror line is the x-axis, just change each (x,y) into (x,-y)

Line of Reflection: Y-axis Y-Axis If the mirror line is the y-axis, just change each (x,y) into (-x,y)

Example #1

Example #2

Example #3

Example #4

Classwork/Homework Pg 480 #1, 3, 5, 8, 30 Workbook Pg 419 all