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Rotational Symmetry
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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
9.10 rotational symmetry
HW pg. 488 #723 odds 2
March 10, 2014
May 67:57 AM
page 505 # 1 1. None2.
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4. 12. No, a figure and its reflection are congruent.13.
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D ET T'
E'D'
K N
T U
N' K'
T'U'
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9.10 rotational symmetry
HW pg. 488 #723 odds 3
March 10, 2014
May 68:18 AM
15.
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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.
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
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 ÷
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.
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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?
9.10 rotational symmetry
HW pg. 488 #723 odds 9
March 10, 2014
May 58:52 AM
9.10 HW pg. 488 #723 odds
9.10 rotational symmetry
HW pg. 488 #723 odds 10
March 10, 2014
Apr 118:11 AM
9.10 rotational symmetry
HW pg. 488 #723 odds 11
March 10, 2014
Apr 118:15 AM
9.10 rotational symmetry
HW pg. 488 #723 odds 12
March 10, 2014
Apr 118:17 AM
9.10 rotational symmetry
HW pg. 488 #723 odds 13
March 10, 2014
Apr 118:19 AM
