Terms and Definitions
What happens to a figure if the scale factor is 1?
Size of the figure does not change
Preimage: (2, 2)
Image: (5, 5)
2.5
Preimage: (7, 2)
Scale factor: 10
(70, 20)
What is another name for a reflection? (think pancake!)
flip
Another name for a translation?
What type of dilation(enlarge or reduce) occurs from a scale factor of 3/2?
enlarge
Preimage: (7, 8)
Image: (56, 64)
8
Preimage: (-3, -8)
Scale factor: 5
(-15, -40)
Preimage: (10, 1). Reflect over y-axis
(-10, 1)
Write the coordinate notation for a translation right 4 units and down 10 units.
(x + 4, y - 10)
Describes how much larger or smaller the image of a dilation is than the pre image
scale factor
Preimage: (6, 3)
Image: (2, 1)
1/3
Preimage: (-26, 36)
Scale factor: 1/2
(-13, 18)
Preimage: (7, 8). Reflect over x-axis
(7, -8)
Apply the translation to (-22, -1)
(x, y) --> (x + 13, y - 5)
(-9, -6)
What type of dilation(enlarge or reduce) occurs from a scale factor of 15?
enlarge
Preimage: (46, 37)
Image: (23, 18.5)
1/2
Preimage: (28, -83)
Scale factor: 5
(140, -415)
Preimage: (-3, 18). Reflect over x-axis then translate left 9 units and down 7 units
(-12, -25)
T or F? The image is congruent to the preimage after a translation.
True
A dilation changes the ________ but not the shape of a geometric figure.
size
Preimage: (53.7, 35.8)
Image: (161.1, 107.4)
3
Preimage: (220, -15)
Scale factor: 1/5
(44, -3)
Preimage: (-4, -8). Translate right 6 units and down 2 units, then reflect over y-axis
(-2, -10)
(x, y) --> (x - 6, y + 1)
left 6, up 1