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Byju's Answer
Standard VIII
Mathematics
Area of a General Quadrilateral
In the given ...
Question
In the given figure
A
B
C
D
E
,
E
Y
=
C
Y
=
4
c
m
,
A
X
=
B
X
=
6
c
m
,
D
E
=
D
C
=
5
c
m
,
D
X
=
9
c
m
D
X
is perpendicular to
E
C
and
A
B
. Find the area of
A
B
C
D
E
.
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Solution
In
△
D
E
Y
,
(
D
E
)
2
=
(
E
Y
)
2
+
(
D
Y
)
2
So,
5
2
=
4
2
+
(
D
Y
)
2
⟹
D
Y
=
3
D
X
=
D
Y
+
X
Y
=
3
+
X
Y
So,
X
Y
=
6
and
D
X
=
9
A
r
(
A
B
C
D
E
)
=
A
r
(
A
B
C
E
)
+
A
r
(
△
D
C
E
)
A
r
(
A
B
C
D
E
)
=
1
2
(
A
B
+
C
E
)
×
X
Y
+
1
2
(
E
C
)
(
D
Y
)
=
12
+
8
2
(
6
)
+
1
2
(
8
)
(
3
)
=
72
c
m
2
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