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Standard VII
Mathematics
Question
Triangles
A
B
C
and
C
D
E
are isosceles triangles,
A
C
E
F
is a straight line. Find the value of
y
.
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Solution
Verified by Toppr
△
A
B
C
a
n
d
△
D
C
E
i
s
a
n
i
s
o
c
e
l
e
s
t
r
a
i
n
g
l
e
∠
D
E
C
+
∠
D
E
F
=
180
∠
D
E
C
=
180
−
124
∠
D
E
C
=
56
o
∠
D
C
E
=
∠
D
E
C
(
s
i
n
c
e
,
△
D
C
E
i
s
a
n
i
s
o
c
e
l
e
t
t
r
i
a
n
g
l
e
)
∠
B
C
A
+
∠
B
C
D
+
∠
D
C
E
=
180
o
∠
B
C
A
+
72
+
56
o
=
180
o
∠
B
C
A
=
52
o
In
△
A
B
C
∠
B
A
C
=
∠
B
C
A
(isoceles
△
)
∠
y
+
∠
B
A
C
+
∠
B
C
A
=
180
o
∠
y
+
52
+
52
o
=
180
o
∠
y
=
76
o
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