Download presentation

Presentation is loading. Please wait.

1
ROTATION .

2
**Rotations in a Coordinate Plane**

In a coordinate plane, sketch the quadrilateral whose vertices are A(2, -2), B(4, 1), C(5, 1), and D(5, -1). Then, rotate ABCD 90 counterclockwise about the origin and name the coordinates of the new vertices. Figure ABCD Figure A’B’C’D’ A(2, -2) A’(2, 2) B(4, 1) B’(-1, 4) C(5, 1) C’(-1, 5) D(5, -1) D’(1, 5) Notice that the x-coordinate of the image is the opposite of the y-coordinate of the preimage. The y-coordinate of the image is the x-coordinate of the preimage. 90 Counterclockwise: (x, y) → (-y, x) 90 Clockwise: (x, y) → (y, -x)

3
**Steps in Rotating a Figure**

Identify the axis of rotation. Construct a line from each point to the axis of rotation. Measure the angle. Construct a line from the measured angle to the axis of rotation. Measure the distance of each point to the axis of rotation. Use the same measurement in locating the position of the image in the line made in step 4. Do these to each point of the figure. Connect all the points (image).

4
**Rotate at 180 degrees from the point of origin.**

180 Counterclockwise: (x, y) → (-x, -y) 180 Clockwise: (x, y) → (-x,-y) Rotate at 90 degrees from the point of origin. 90 Counterclockwise: (x, y) → (-y, x) 90 Clockwise: (x, y) → (y, -x)

5
**Tessellation Learning Target: Tessellation**

I can apply transformations (reflection, translation and rotation) by making a tessellation. Tessellation A tessellation or tiling of the plane is a pattern of plane figures that fills the plane with no overlaps and no gaps.

6
**Examples of Tessellation**

7
**Examples of Tessellation**

8
**Examples of Tessellation**

9
**Examples of Tessellation**

10
**Steps in making a tesselations**

Draw a 4 by 4 squares (each square is 2 inches by 2 inches) in a printing paper. Draw one square on top of the paper. On this square draw the pattern of your tessellation. Create your tessellation design by drawing the pattern in the rest of the squares using transformations. Color your tessellation.

11
**Steps in making a tesselations**

5. Using your tessellation, identify the following: (Note: To identify location of squares, think of your design as quadrant I of a Cartesian plane.) a. At least 3 pairs of squares showing reflection. b. At least 3 pairs of squares showing translation. c. At least 3 pairs of squares showing rotation. 6. Describe the rule in each transformation. Sample answers for #5 and #6: (1,4) reflected over y-axis (2,4) (1,1) translated up 1 unit to (1,2) (1,3) rotated 90 degrees clockwise to (2,2)

12
Enjoy the activity!

Similar presentations

OK

Perform Congruence Transformations. A __________________ is an operation that moves or changes a geometric figure to produce a new figure called an __________.

Perform Congruence Transformations. A __________________ is an operation that moves or changes a geometric figure to produce a new figure called an __________.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on object-oriented programming php Ppt on layer 3 switching tutorial Ppt on content addressable memory applications Ppt on brand equity Download ppt on turbo generator aircraft Ppt on home security systems Ppt on trial and error problem Ppt on bmc remedy training Ppt on village life and city life Best ppt on ozone layer