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contestada

On the coordinate plane, plot and label these points: =(2,1)
A
=
(
2
,
1
)
, =(5,1)
B
=
(
5
,
1
)
, =(7,2)
C
=
(
7
,
2
)
, =(4,2)
D
=
(
4
,
2
)
What is the length of
C
D
?
What kind of quadrilateral is
A
B
C
D
?