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Transformations
Transformation Rules
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Geometry & Trigonometry
Transformations
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1
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translation rule for a unit right and b units up
(x,y)-->(x + a, y + b) a= horizontal shift b = vertical shift
2
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Translation rule for a units left and b units down
(x,y)——>(x-a,y-b)
3
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reflection over the x-axis (Rule)
(x,y)-->(x, -y)
4
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reflection over the y-axis (Rule)
(x,y)-->(-x, y)
5
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Reflection over the y=x rule
(x,y) -> (y,x)
6
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rotation of 90º Clockwise about the origin (Rule) same for 270 CCW
(x,y)-->(y, -x)
7
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rotation of 180º CW/CCW about the origin (Rule)
(x,y)-->(-x, -y)
8
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rotation of 90 CCW/270º Clockwise about the origin (Rule)
(x,y)-->(-y, x)
9
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Reflection (Definition)
A transformation of a figure that FLIPS the figure across a line of symmetry
10
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Translation (Definition)
A transformation of the movement (SLIDE) of a figure along a straight line
11
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Rotation (Definition)
A transformation in which a figure is TURNED around a point of rotation
12
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Identify the examples of rigid motions (congruent)
rotation, reflection, translation
13
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The reflection of the point (4, 2) across the x-axis is the point ___.
(4, -2)
14
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The reflection of the point (4, 2) across the y-axis is the point ___.
(-4, 2)
15
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A reflection of the point (4,2) across the line y=x is the point_______
(2,4)
16
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The translation of point (4, 2) using the vector
(1, 4)
17
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The rotation of the point (4, 2) 90º Clockwise about the origin is the point ____________
(2, -4)
18
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The rotation of the point (4, 2) 180º counterclockwise (CCW) about the origin is the point ____________
(-4, -2)
19
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The rotation of the point (4, 2) 90º counter Clockwise (CCW) about the origin is the point ____________
(-2,4)
20
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rotation of 90º Clockwise is the same rule as....
270 counter clockwise
21
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rotation of 270º Clockwise is the same rules as...
90 counter clockwise
22
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A line of reflection is the _________ _______________ of the any segment connecting a domain point to a range point.
perpendicular bisector
23
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The magnitude (or degree) of rotation symmetry that maps a regular polygon onto itself formula
360/number of sides
24
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order of rotational symmetry
the number of times the figure coincides with itself as it rotates through 360 degrees. For regular polygons it equals the number of sides.
25
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Rigid figures preserve......
distance between points, angles measures, betweenness of points, and collinearity
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