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Standard IX
Mathematics
Question
In the following figure,
A
B
C
D
and
P
O
R
S
are two parallelograms such that
∠
D
=
120
o
and
∠
Q
=
70
o
. Find the value of
x
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Solution
Verified by Toppr
Since
P
Q
R
S
is parallelogram
∠
S
=
∠
Q
(opposite angles of a parallelogram)
∠
S
=
70
∘
Now,
A
B
C
D
is a parallelogram
∠
D
+
∠
C
=
180
∘
120
∘
+
∠
C
=
180
∘
∠
C
=
60
∘
Therefore,
∠
S
+
∠
C
+
x
=
180
∘
70
∘
+
60
∘
+
x
=
180
∘
x
=
50
∘
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