Chapter 9 Vocab

Question 1

Rotation of 90 degrees

Answer 1

(x,y)=(-y,x)

Question 2

Rotation of 180 degrees

Answer 2

(x,y)=(-x,-y)

Question 3

Rotation of 270 degrees

Answer 3

(x,y)=(y,-x)

Question 4

Rotation of 360 degrees

Answer 4

(x,y)=(x,y)

Question 5

Rotation

Answer 5

turning a figure about a center of rotation by a specific number of degrees, called the angle of rotation

Question 6

Reflection

Answer 6

transformation thaat maps each point of the pre image to another point (the image) the same distance from the line of reflection, the orientation of the figure reverses

Question 7

Transformation

Answer 7

a function, or mapping, the results in a change in the position, shape, or size of the figure

Question 8

Preimage

Answer 8

the original figure

Question 9

Image

Answer 9

the resulting figure

Question 10

Rigid Motion

Answer 10

transformation that preserves distance and angle measures

Question 11

Translation

Answer 11

transformation that maps all points of a figure the same distance in the same direction (slide)

Question 12

Composition of transformations

Answer 12

combination of two or more transformations

Question 13

Glide Reflection

Answer 13

composition of a transformation (glide) and a reflection across a line parallel to the direction of translation

Question 14

Isometry

Answer 14

transformation that preserves distance or length

Question 15

Congruent

Answer 15

two figures are congruent if and only iff there is a sequence of one or more rigid motions that maps one figure onto the other

Question 16

Congruence transformations

Answer 16

compositions of rigid motions

Question 17

Dilation

Answer 17

change in size with center of dilation and scale factor, preserves angle measures

Question 18

Enlargement

Answer 18

if the scale factor ‘n’ is greater then 1

Question 19

Reduction

Answer 19

if the scale factor ‘n’ is between 0 and 1

Question 20

Similarity transformation

Answer 20

compositions of rigid motions and dilations that map preimages to similar images

Question 21

Similiar

Answer 21

two figures are similar iff there is a similarity transformation that maps one figure onto the other