# Matrices

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1. Rx=
• [1 0]
• [0 -1]
• (x',y') - (x, -y)
2. Ry=
• [-1 0]
• [ 0 1]
• (x', y') -- (-x, y)
3. Ry= -x=
• [0 -1]
• [-1 0]
• (x', y') -- (-y, -x)
4. R0,90=
• [0 -1]
• [1 0]
• (x', y') -- (-y,x)
5. Ro, 180
• [-1 0]
• [0 -1]
• (x', y') -- (-x, -y)
6. Ro, 270
• [ 0 1]
• [-1 0]
• (x', y') -- (y, -x)
7. Rotations
If P isn't the center then PO = P'O and m< POP' = angle of rotation
8. A ______ can be expressed as a composition of 2 reflections over 2 parallel lines
Translation
9. A _______ can be expressed a a composition of 2 relections over 2 intersecting lines
Rotation
10. Line Symmetry
there exists a line k such that Rk maps the figure onto itself
11. Point Symmetry
there exists a point O such that Ho maps the figure onto itself
12. Translational symmetry
there exists a translation that maps a figure onto itself
 Author: sweetchildren ID: 11737 Card Set: Matrices Updated: 2010-03-23 20:20:29 Tags: Geometry Folders: Description: Matrices for transformations Show Answers: