Level 372
Level 374

#### 36 words 0 ignored

Ready to learn
Ready to review

## Ignore words

Check the boxes below to ignore/unignore words, then click save at the bottom. Ignored words will never appear in any learning session.

**Ignore?**

*Translations*

When you slide one figure from one position to another.

A slide!

What is another word for translations?

*Reflections*

When you flip a figure over a line.

A flip!

What is another word for reflection?

Reflect over x-axis means...

x-coordinates stay the same, y-coordinates are opposites.

Reflect over the y-axis means...

y-coordinates stay the same, x-coordinates are opposites.

*Rotations*

90 degree clockwise, 180 degree clockwise, & 270 degree clockwise.

y-Coordinate

The vertical measure, which is the second number in an ordered pair.

x-Coordinate

is the first number in an ordered pair and it represents the location relative to the x-axis.

add!

Up and Right:

subtract!

down and Left:

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

reflecting over x-axis

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

reflecting over y-axis

y=x

(x,y)-(y,x)

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

Rotating 90 cw

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

Rotating 90 ccw

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

rotating 180

image

the resulting figure AFTER a transformation is performed on it

Preimage

The image that I start with is called:

translation

It is a transformation that moves points the distance and in the same direction.

Isometry

a transformation that does not change the size or shape of a figure

Translation Theorem

A translation is an isometry.

reflection

It is a transformation that flips a figure over a line of reflection.

mirror line

Line of Reflection

(a, -b)

Reflection in the x-axis

(-a, b)

Reflection in the y-axis

(b, a)

Reflection when y= x

(-b, -a)

Reflection when y= -x

Reflection Theorem

A reflection is an isometry.

rotation

It is a transformation that turns a figure about a fixed point.

Center of Rotation

point around which a figure rotates

angle of rotation

formed by rays drawn from the center of rotation to a point and its image

90 Rotation

(-b, a)

180 Rotation

(-a, -b)

270 Rotation

(b, -a)

Rotation Theorem

A rotation is an isometry.