Transcript Reflection, Rotation, or Translation
Coordinates and Design
What numbers would you write on this line?
Each space is 1 unit 0
What numbers would you write on this line?
Each space is 1 unit 0
The Cartesian Plane (or coordinate grid) is made up of two number lines that intersect perpendicularly at their respective zero points.
ORIGIN The point where the x-axis and the y-axis cross (0,0)
The horizontal axis is called the x -axis.
The vertical axis is called the y -axis.
The Coordinate Grid is made up of 4 Quadrants.
QUADRANT II QUADRANT I QUADRANT III QUADRANT IV
The signs of the quadrants are either positive (+) or negative (-).
QUADRANT II (-, +) QUADRANT I (+, +) QUADRANT III (-, -) QUADRANT IV (+, -)
Identify Points on a Coordinate Grid A: (x, y) B: (x, y) C: (x, y) D: (x, y)
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1.1 The Cartesian Plane
Student Outcome: Identify and plot points in the 4 quadrants of the Cartesian plan using ordered pairs
Identify Points on a Coordinate Grid
A: (5, 7) B: (5, 3) C: (9, 3) D: (9, 7)
When we read coordinates we read them in the order x then y Plot the following points on the smart board A: (9, -2) B: (7, -5) C: (2, -4) D: (2, -1) E: (0, 1) F: (-2, 3) G: (-7, 4)
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Units not the same in terms of intervals Switch the order that they appear Wrong symbols for quadrants
Textbook: Page 9 #5, 7, for questions 9 and 10 plot on two separate graphs. Graph paper is provided for you. Challenge #14, 16
Put your thinking cap on!
What is the following question asking us to find?
Label each
vertex
of each shape.
Question!
What is a vertex?
What is a vertex?
B • A vertex is a point where • meet.
• The plural is vertices!
two sides of a figure A The vertices of the Triangle are A (x, y) B (x, y) C (x, y) A (4, 4) B (0, 4) C (2, 0) C
Graphic Artists use coordinate grids to help them make certain designs. Flags, corporate logos can all be constructed through the use of our coordinate grids.
Study the following Flag.
How many vertices can you find in the design.
Imagine seeing this on a coordinate grid. Notice how it is centered and equally distributed on each side.
Assignment: You have been hired to create a flag for the company “Flags R Us!” They are looking for a new creative design that can be based on an interest or hobby of yours. The flag design can be a cool pattern or related to any sport, hobby, or activity you are involved with.
The flag needs to have a minimum of 10 Vertices. They want a detailed location of any 10 vertices located on the bottom of your design (list the coordinates). It is your responsibility to use a coordinate grid to create your own pattern.
Your Flag will be evaluated as following” ◦ Neatness: (Have you made sure to color inside the lines).
◦ Vertices: (Do you have at least 10).
◦ ◦ Design : (Have you used designs and shapes to create an image).
Handout : (Do you have all the vertices clearly labeled in a legend).
Student Name: 10 Vertices A) B) C) D) E) F) G) H) I) J)
BLM 1-3, BLM 1-4, BLM 1-5, BLM 1-6
This section will focus on the use of Translations, Reflections, Rotations, and describe the image resulting from a transformation.
◦ Transformations: Include translations, reflections, and rotations.
Translation Reflection Rotation
Translations are SLIDES!!!
Let's examine some translations related to coordinate geometry.
Translation: ◦ A slide along a straight line Count the number of horizontal units and vertical units represented by the translation arrow.
The horizontal distance is 8 units to the right, and the vertical distance is 2 units down (+8 -2)
Translation: ◦ Count the number of horizontal units the image has shifted.
◦ Count the number of vertical units the image has shifted.
We would say the Transformation is: 1 unit left,6 units up or (-1+,6)
In this example we have moved each vertex 6 units along a straight line. If you have noticed the corresponding A is now labeled A’ What about the other letters?
A translation "slides" an object a fixed distance in a given direction. The original object and its translation have the same shape and size, and they face in the same direction
When you are sliding down a water slide, you are experiencing a translation. Your body is moving a given distance (the length of the slide) in a given direction. You do not change your size, shape or the direction in which you are facing.
Let’s Practice Textbook Page 25 ◦ Question #4a, b, 5,
4 a) What is the translation shown in this picture?
6 units right, 5 units up Or (+6,+5)
4 b) What is the translation in the diagram below?
Horizontal Distance is: 6 units left Vertical Distance is: 4 units up Or (-6,+4)
#5 B) The coordinates of the translation image are ◦ P'(+7, +4), Q’(+7, –2), ◦ R'(+6, +1), S'(+5, +2).
C) The translation arrow is shown: 3 units right and 6 units down. (+3, -6)
Is figure A’B’C’D’ a reflection image of figure ABCD in the line of reflection, n?
How do you know?
Figure A'B'C'D'
IS
a reflection image of figure ABCD in the line of reflection,
n
. Each vertex in the red figure is the same distance from the line of reflection,
n
, as its reflected vertex in the blue image.
A reflection is often called a flip.
Under a reflection, the figure does not change size. It is simply flipped over the line of reflection.
Reflecting over the x-axis: When you reflect a point across the x axis, the x coordinate remains the same, but the y coordinate is transformed into its opposite.
Reflecting over the y-axis: Where do you think this picture will end up?
Assignment Page 25 Lets go over #7 and #8 as a class.
Page 26 # 10,11, and12 on your own!
Question #10
Question #11 The coordinates of A'B'C'D'E'F'G'H' are: ◦ A’(+2,+2) B’(0,+2) E'(+2, – 4), F'(+3, – 4), C’(0,-5) D’(+2, – 5), G'(+3, – 2), H'(+2, – 2).
Question #12
◦ ◦ Rotation: A turn about a fixed point called “the center of rotation” The rotation can be clockwise or counterclockwise.
Assignment Page 27 Lets go over #13 and #14 as a class.
Page 27-28 # 15 , 16,17, and18 on your own!
Pg 27. #13 a) The coordinates for ∆HAT are H( – 3, – 2), A( – 1, – 3), and T( – 3, – 6). The coordinates for ∆HAT are H( – 3, – 2), A( – 1, – 3), and T( – 3, – 6). b) The rotation is 180 counterclockwise.
Pg 27 #15.
a) The coordinates for the centre of rotation are (–4, –4).
b) Rotating the figure 90 ° rotating it 270 ° clockwise will produce the same image as in the opposite direction, or counterclockwise.
#16 a) The coordinates for the centre of rotation are (+2, – 1). b) The direction and angle of the rotation could be 180 ° clockwise or 180 ° counterclockwise.
#17 a) The figure represents the parallelogram rotated about C, 270 ° clockwise.
b) The coordinates for Q'R'S'T' are Q'( – 1, – 1), R'( – 1, +2), S'(+1, +1), and T'(+1, – 2).
# 18 b) The rotation image is identical to the original image.
by D. Fisher
Zebras have slightly different stripping, Ears not similar, leg bent different.
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PROBABLY DOESN’T FIT ANY CATEGORY
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Why possibly both?
Either reflected or rotated 180°
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REFLECTION IN SEVERAL DIRECTIONS
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Reflection in multiple mirrors.
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Assignment Page 36-37 # 1-10, 12, 15, 16, 18 and 21 on your own!
The Ultimate PowerPoint Game
Each team will hide their 4 battleships in their letter HIDDEN Mathematical Ocean by writing the correct number of points for each battleship with its corresponding All ships must be either horizontal vertical or Ships may not overlap Draw a rectangle around the correct number of points for each battleship
This is the INSIDE board.
Keep this board HIDDEN from the other team!
Teams will take turns being the ATTACKERS DEFENDERS and the The ATTACKERS will select a place to attack by giving an ordered pair of numbers to the DEFENDERS The ATTACKERS will then write the ordered pair in the box to the side and circle that point on their VISIBLE Mathematical Ocean The DEFENDERS will find the coordinate on their HIDDEN Mathematical Ocean and circle it The DEFENDERS ( ATTACKERS will say if the attack was a HIT fill-in circle) or a MISS ( ATTACKERS circle empty) Teams will then switch roles leave
If the coordinate is not written in the box on the side, the attack is automatically a MISS If the coordinate is not in the Mathematical Ocean , the attack is automatically a MISS If the ATTACKERS sink one of your battleships, you must tell tell them. Otherwise you will LOSE one turn.
The ATTACKERS will connect the points once the entire ship is SUNK .
To WIN other team’s battleships before they sink all of yours the game you must sink all of the the
Use this board to ATTACK .
Keep this board VISIBLE !
This is the OUTSIDE board.
Aircraft Carrier (5 A points) Cruiser (4 C points) Destroyer (3 D points) Submarine (2 S points)
on the HIDDEN Mathematical Ocean
Battleships 1 Aircraft Carrier (AAAAA) 1 Cruiser (CCCC) 1 Destroyer (DDD) 1 Submarine (SS) Use this board to HIDE your battleships.
Keep this board HIDDEN from the other team!
This is the INSIDE board.
Use this board to ATTACK .
Keep this board VISIBLE !
This is the OUTSIDE board.