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# 9.10 notes

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### 9.10 notes

1. 1. 9.10 rotational symmetry April 10, 2012 Graph the triangle. A(1,3), B(4, 1), C(3, ­2) Bellwork Objective: graph rotations and identify rotational symmetryHW pg. 509 #1­17 odds 1
2. 2. 9.10 rotational symmetry April 10, 2012 page 505 # 1­    1. None 6.  10.   2.  11.  3.  7.  4.  12. No, a figure and its reflection are congruent. D 13.  E 8.  T T D E 5. 14.  K N N K 9.  T U U THW pg. 509 #1­17 odds 2
3. 3. 9.10 rotational symmetry April 10, 2012 15. 18. 16. 17.HW pg. 509 #1­17 odds 3
4. 4. 9.10 rotational symmetry April 10, 2012 rotation ­ turns a figure about a fixed point (center of rotation) angle of rotation ­ angle measure of the rotation R Q 90o R Center of rotation P Q A figure and its rotation image are congruent. All rotations that we will do will be counterclockwise.HW pg. 509 #1­17 odds 4
5. 5. 9.10 rotational symmetry April 10, 2012HW pg. 509 #1­17 odds 5
6. 6. 9.10 rotational symmetry April 10, 2012 Find the vertices of the image of ΔACB after a rotation of 180o about the origin. B C AHW pg. 509 #1­17 odds 6
7. 7. 9.10 rotational symmetry April 10, 2012 A figure has rotational symmetry if you can rotate it 180o, 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 Angle of Rotation is 360o ÷  AHW pg. 509 #1­17 odds 7
8. 8. 9.10 rotational symmetry April 10, 2012 Judging from appearance, state whether the flower has rotational symmetry.   If so, what is the angle of rotation. 2 3 1HW pg. 509 #1­17 odds 8
9. 9. 9.10 rotational symmetry April 10, 2012 Does the figure have rotational symmetry?  What is the angle of rotation?HW pg. 509 #1­17 odds 9
10. 10. 9.10 rotational symmetry April 10, 2012 9.10 HW pg. 509 #1 ­ 17 oddsHW pg. 509 #1­17 odds 10