Module 1 Lesson 12B Translations and Rotations on a Coordinate Plane.notebook

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Lesson 12B Translations and Rotations on a

Coordinate Plane

HWHW Questions on last page

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Module 1 Lesson 12B Translations and Rotations on a Coordinate Plane.notebook

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A

y = x

A'

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AA'

y = ­x

Module 1 Lesson 12B Translations and Rotations on a Coordinate Plane.notebook

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y = ­x

A

B

CA'B'

C'

(x,y) ­­> (y,­x)

Module 1 Lesson 12B Translations and Rotations on a Coordinate Plane.notebook

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movex-axis y-axis

Size Shape orientation

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1) What is the image of the points in figure ABC (x,y) (x-7,y-3) ?

A (3,1), B (4,4), C (1,2)

2) What is the images of the points in figure ABC (x,y) (x+4,y+1)?

A (-3,-1), B (-4,-4), C (-1,-2)

Module 1 Lesson 12B Translations and Rotations on a Coordinate Plane.notebook

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Module 1 Lesson 12B Translations and Rotations on a Coordinate Plane.notebook

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Module 1 Lesson 12B Translations and Rotations on a Coordinate Plane.notebook

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A rotation is a transformation in which a figure is rotated, or turned, about a fixed point.

The center of rotation is the fixed point.

A rotation does not change the size or shape of the figure (the preimage and image are congruent)

Each point of the original figure (the preimage) and its image are the same distance from the center of rotation.

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Rotating a point around the center of rotation moves the point from quadrant to quadrant.

90

180 270

360

Module 1 Lesson 12B Translations and Rotations on a Coordinate Plane.notebook

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Module 1 Lesson 12B Translations and Rotations on a Coordinate Plane.notebook

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Rules for Rotations90 degrees clockwise/ : (x,y) (y,-x)

270 degrees counterclockwise

180 degrees: (x,y) (-x,-y)

90 degrees counter clockwise/: (x,y) (-y,x)

270 degrees clockwise

Module 1 Lesson 12B Translations and Rotations on a Coordinate Plane.notebook

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Module 1 Lesson 12B Translations and Rotations on a Coordinate Plane.notebook

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