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Dilations Review
Contributed by: Ricketson
(Original author: Childress)
All transformations in this test are Dilations.
What is a Dilation?
Dilations
red or blue
enlarge or shrink
dog or cat
Dilations are changes caused by scale factors.
Dilated by 4 -->means x4
2
4
3
x4
8
16
Dilated by  1/3---->  means divide by 3
24
18
21
x  1/3
8
6
pre-image
(2,6)
Dilate a point by  5
x5
x5
multiply the x by 5
multiply the y by 5
(10,
image
)
(4,-7)
pre-image
Dilate  by 
3
(
image
,
)
(8,10)
pre-image
Dilate  by 
1/2
(
image
,
)
(-4,-7)
pre-image
Dilate  by 
2
(
image
,
)
2
-2
4
-4
6
-6
2
-2
4
-4
6
-6
8
-8
10
-10
B'
A'
C'
(
(
(
,
,
,
A
)
)
)
B
C
Dilate by 2
Dilate by  7
5
7
10
8
image
2
-2
4
-4
6
-6
2
-2
4
-4
6
-6
8
-8
10
-10
B'
A'
C'
(
(
(
,
,
,
B
)
)
)
A
Dilate by 3
C
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