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Byju's Answer
Standard IX
Mathematics
Parallel Lines with Transversal
In the given ...
Question
In the given figure,
A
E
∥
B
D
,
A
C
∥
E
D
and
A
B
=
A
C
. Find
∠
a
.
A
63
o
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B
64
o
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C
62
o
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D
None of the above
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Solution
The correct option is
A
64
o
Here,
∠
E
D
C
=
58
∘
(Vertically opposite angles)
Given
A
E
∥
C
D
so,
⟹
∠
c
=
∠
E
D
C
=
58
∘
[Corresponding angles]
Also,
A
C
∥
E
D
⟹
∠
A
C
B
=
∠
E
D
C
=
58
∘
[Corresponding angles)
Since,
A
B
=
A
C
⟹
∠
A
B
C
=
∠
A
C
B
=
58
o
[Isosceles triangle property]
Now, in
△
A
B
C
,
∠
A
B
C
+
∠
A
C
B
+
∠
B
A
C
=
180
o
⟹
58
o
+
58
o
+
∠
a
=
180
o
⟹
116
o
+
∠
a
=
180
o
⟹
∠
a
=
180
o
−
116
o
⟹
∠
a
=
64
o
Hence, option
B
is correct.
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