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9.10 rotational symmetry HW pg. 488 #723 odds 1 March 10, 2014 May 57:56 AM Objective: graph rotations and identify rotational symmetry Graph the triangle. A(1,3), B(4, 1), C(3, 2) Bellwork
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May 18, 2015

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Rotational Symmetry
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Page 1: 9.10 notes

9.10 rotational symmetry

HW pg. 488 #7­23 odds 1

March 10, 2014

May 5­7:56 AM

Objective: graph rotations and identify rotational symmetry

Graph the triangle.A(1,3), B(4, 1), C(3, ­2)

Bellwork

Page 2: 9.10 notes

9.10 rotational symmetry

HW pg. 488 #7­23 odds 2

March 10, 2014

May 6­7:57 AM

page 505 # 1­ 1. None2. 

3. 

4.  12. No, a figure and its reflection are congruent.13. 

14. 

 6. 

7. 

8. 

9. 

D ET T'

E'D'

K N

T U

N' K'

T'U'

5.

10.  

11. 

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9.10 rotational symmetry

HW pg. 488 #7­23 odds 3

March 10, 2014

May 6­8:18 AM

15.

16.

17.

18.

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9.10 rotational symmetry

HW pg. 488 #7­23 odds 4

March 10, 2014

May 5­7:59 AM

rotation ­ turns a figure about a fixed point (center of rotation)

angle of rotation ­ angle measure of the rotation

90o

P Q

R

R' Q'

Center of rotation

A figure and its rotation image are congruent.

All rotations that we will do will be counterclockwise.

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9.10 rotational symmetry

HW pg. 488 #7­23 odds 5

March 10, 2014

May 5­8:05 AM

Find the vertices of the image of ΔACB after a rotation of 180 o about the origin.

A

BC

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9.10 rotational symmetry

HW pg. 488 #7­23 odds 6

March 10, 2014

May 5­8:08 AM

A figure has rotational symmetry if you can rotate it 180 o, or less, so that its image matches the original figure.

The angle (or its measure) through which the figure rotates is the angle of rotation.  

A

A'Angle of Rotation is 360 o ÷ 

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9.10 rotational symmetry

HW pg. 488 #7­23 odds 7

March 10, 2014

May 5­8:48 AM

Judging from appearance, state whether the flower has rotational symmetry.  If so, what is the angle of rotation.

1

2

3

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9.10 rotational symmetry

HW pg. 488 #7­23 odds 8

March 10, 2014

May 5­8:50 AM

Does the figure have rotational symmetry?  What is the angle of rotation?

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9.10 rotational symmetry

HW pg. 488 #7­23 odds 9

March 10, 2014

May 5­8:52 AM

9.10 HW pg. 488 #7­23 odds

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9.10 rotational symmetry

HW pg. 488 #7­23 odds 10

March 10, 2014

Apr 11­8:11 AM

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9.10 rotational symmetry

HW pg. 488 #7­23 odds 11

March 10, 2014

Apr 11­8:15 AM

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9.10 rotational symmetry

HW pg. 488 #7­23 odds 12

March 10, 2014

Apr 11­8:17 AM

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9.10 rotational symmetry

HW pg. 488 #7­23 odds 13

March 10, 2014

Apr 11­8:19 AM