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Reflection: an isometry (or rigid motion) in which a figure is flipped giving its image an opposite orientation.
9-2
Example 1: Reflect triangle GLQ across the x-axis. Then state the coordinates of the image. Then on the same coordinate plane reflect the ORIGINAL image across the y-axis.
Reflected Across x-axis
G = (3,4) G’=________
L = (1,2) L’= ________
Q = (4,-1) Q’=________
Reflected Across y-axis
G = (3,4) G’=________
L = (1,2) L’= ________
Q = (4,-1) Q’=________
Example 2: Reflect the image across the line y = 1.
Example 3: Reflect the image with points F (2,2) W (2, 5) and K( 3, 3) across the line x= 3.
a)
b)
Example 4:
Example 5:a) Reflect point A(-2, 3) across the line y = x.
What's the rule for reflection across the line y =x?
b) Reflect point B( 2, 3) across the line y =- x.
What's the rule for reflection across the line y = - x?
Example 6: Reflect the figure below across the line y = x.
