12.4. Rotations http://www.ck12.org
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Two ReflectionsThe vertices of 4 GHIareG(− 2 , 2 ),H( 8 , 2 )andI( 6 , 8 ). Use this information to answer questions
24-27.
- Plot 4 GHIon the coordinate plane.
- Reflect 4 GHIover thex−axis. Find the coordinates of 4 G′H′I′.
- Reflect 4 G′H′I′over they−axis. Find the coordinates of 4 G′′H′′I′′.
- Whatonetransformation would be the same as this double reflection?
Multistep Construction Problem
- Draw two lines that intersect,mandn, and 4 ABC. Reflect 4 ABCover linemto make 4 A′B′C′. Reflect
4 A′B′C′over linento get 4 A′′B′′C′′. Make sure 4 ABCdoes not intersect either line. - Draw segments from the intersection point of linesmandntoAandA′′. Measure the angle between these
segments. This is the angle of rotation between 4 ABCand 4 A′′B′′C′′.