1. Know the angle of rotation.

2. Know the direction (either it is clockwise or counterclockwise)

3. Use the formula of the given angle to each point.

90 degree rotation

(x,y) → (-y,x)

-90 degree rotation

(x,y) → (-y,x)

180 degree rotation

(x,y) → (-x,-y)

270 degree rotation

(x,y) → (y,-x)

## Monday, February 20, 2012

### How do we use the other definitions of transformations?

Glide reflection- its a reflection of a figure in a lince and a translation along that line.

Orientaion- The arrangments of points.

Isometry- When the image of the LENGTH and the SIZE stays the same after the transformation to the original shape.

Direct Isometry- when the orientaion of the letters stay the same and it's length.

Opposite Isometry- The letter points of the shape, is backwards on the image but the length are the same. Just like a reflection.

Orientaion- The arrangments of points.

Isometry- When the image of the LENGTH and the SIZE stays the same after the transformation to the original shape.

Direct Isometry- when the orientaion of the letters stay the same and it's length.

Opposite Isometry- The letter points of the shape, is backwards on the image but the length are the same. Just like a reflection.

## Saturday, February 11, 2012

### How do we graph dilations?

- Dilation is one of the four transformations that causes an image to stretch
or shrinks using it's scale factor, to it's original size.
* The description of A dilation usually includes the scale factor Or the ratio.
* With the scale factor, you have to multiply the dimensions of the original
To get the answer of the dilated image.

## Monday, February 6, 2012

### How do we identify transformations ?

**A transformation is when you move a geometric figure. Including translation, rotation, reflection, and dialtion.**

- Translation- Every point is moved the same distance in the same direction.
- Reflection- figure is flipped over a line of symmetry.
- Rotation- Figure is turned around in one point.
- Dialtion- An enlargment or reduction in size of the image.

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