Tuesday, June 22, 2016 11.3 Reflections 11.3 Reflections

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Presentation transcript:

Tuesday, June 22, 2016 11.3 Reflections 11.3 Reflections Tuesday, June 22, 2016

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) 2) line of reflection Yes. No way, replay.

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′

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)