University:
High School
Course:
High School Mathematics
Academic year:

2020
Views:

62

Pages:

3
Author:

MarleyC

Reflections In your own words, write the meaning of each vocabulary term. � 11 M; f rof I\ II or glide reflection / , i II ppev-_/ II �!.�.�:�!�?_n_ I i' V\ e 'i rJ "\ reflection symmetry s/ti-h.'or'I foil ,,w� q' I Dy ,;, I t '•·,•!1! {''--· ·:',', 0 r \ r e (It' r. .f.- o :.1 (,, line of symmetry +rvi r\ Core Concepts Reflections A reflection is a transformation that uses a line like a mirror to reflect a figure. The mirror line is called the line of reflection. A reflection in a line m maps every point Pin the plane to a point P', so that for each point on of the following properties is true. • If P is not m, then m is the perpendicular bisector of PP', or • If P is on m, then P = P'. S"v-1 � l-� s,ks Core Concepts point P not on m point Pon m Coordinate Rules for Reflections If (a, b) is reflected in the x-axis, y --,- then its image is the point (a, -b). f = then its image is the point (b, a). x, then its image is the point (-a, b). �ff'osi+c. "ffchi+e. If (a, b) is reflected in the line y If (a, b) is reflected in the y-axis, y - ,_ V - -, I- X tlip�ol If (a b) is reflected in the line y = -x, then its image is the point (-b, -a). -tl;pptd Ct, ,1 "ffOSlft!. Postulate 4.2 Reflection Postulate A reflection is a rigid motion. v-,.,,...---- evfryfh,'i-.) -- s �'-"' p e. •-• - :i J -- - ◄ #i� I 1-+-c+-+-1-Y+-•