1. Tuesday, June 22, 2016
11.3 Reflections
11.3 Reflections
Tuesday, June 22, 2016

2. reflection – a transformation in which an image is flipped across a line
line of reflection – the border that is exactly between a figure and its reflected image
Tell whether the blue figure is a reflection of the red figure.
1) )
line of reflection
Yes.
No way, replay.

3. R′(‒6 , ‒4) I′ (0 , ‒7) B′ (5 , ‒1) I R B B′ R′ I′
1) Draw the figure and its reflection in the x-axis. Identify the coordinates of the image.
R (‒6 , 4), I (0 , 7) B (5 , 1) I
R′(‒6 , ‒4) R
I′ (0 , ‒7) B
B′ (5 , ‒1) B′ R′ I′

4. Reflection in x‒axis: (x, y)(x, ‒y)
THERE’S A PATTERN IN FINDING COORDINATES OF THE REFLECTION.
►To reflect a figure in the x‒axis, use the opposites of the y‒coordinates.
►To reflect a figure in the y‒axis, use the opposites of the x‒coordinates.
Reflection in x‒axis: (x, y)(x, ‒y)
Reflection in y‒axis: (x, y)(‒x, y)
2) Without drawing, identify the coordinates when reflecting the figure in the y‒axis.
A (5, ‒1), U (6, 0), D (0, ‒4), I(‒2, ‒2)
A′ (‒5, ‒1), U′ (‒6, 0), D′ (0, ‒4), I′(2, ‒2)