Describe Transformation Effects Using Coordinates
8th Grade Math · Flashcards
8TH GRADE MATH · FLASHCARDS
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QUESTION
Identify the image of
P
(
−
6
,
8
)
P(-6,8)
P
(
−
6
,
8
)
after dilation about the origin with
k
=
1
2
k=\frac{1}{2}
k
=
2
1
.
QUESTION
Which transformations always preserve distance (are rigid motions): translation, rotation, reflection, dilation?
QUESTION
What is the image of
(
x
,
y
)
(x,y)
(
x
,
y
)
after a dilation with scale factor
k
k
k
centered at
(
a
,
b
)
(a,b)
(
a
,
b
)
?
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ANSWER
(
a
+
k
(
x
−
a
)
,
b
+
k
(
y
−
b
)
)
(a+k(x-a),\,b+k(y-b))
(
a
+
k
(
x
−
a
)
,
b
+
k
(
y
−
b
))
. Scale distance from center
(
a
,
b
)
(a,b)
(
a
,
b
)
by factor
k
k
k
.
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