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Byju's Answer
Standard VIII
Mathematics
Quadrilaterals
ABCD is a rho...
Question
ABCD
is a rhombus. If
∠
DAC
=
25
∘
,
then the measure of
∠
ABC
is
.
A
155
∘
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B
130
∘
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C
65
∘
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Solution
The correct option is
B
130
∘
Given:
∠
D
A
C
=
25
∘
To find:
∠
A
B
C
∠
B
A
C
=
∠
D
A
C
=
25
∘
[ Diagonal AC bisects the
∠
D
A
B
]
∠
D
A
B
=
∠
B
A
C
+
∠
D
A
C
∠
D
A
B
=
25
∘
+
25
∘
=
50
∘
Now,
∠
D
A
B
+
∠
A
B
C
=
180
∘
[Adjacent angles of a parallelogram]
∠
A
B
C
=
180
∘
−
∠
D
A
B
∠
A
B
C
=
180
∘
−
50
∘
=
130
∘
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