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Byju's Answer
Standard VII
Mathematics
Angle Sum Property
In the figure...
Question
In the figure(not drawn to scale), AHB, CHD and EHF are straight lines. Find x.
A
25
o
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B
16
o
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C
27
o
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D
28
o
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Solution
The correct option is
B
16
o
Given that
A
H
B
,
C
H
D
and
E
H
F
are straight lines.
∠
C
H
E
=
∠
F
H
D
=
50
∘
....Vertically opposite angles
∠
A
H
B
=
180
∘
AHB is a straight line.
∠
A
H
B
=
72
∘
+
∠
C
H
E
+
42
∘
+
x
=
180
∘
Substitute value of angle
C
H
E
, we get
72
∘
+
50
∘
+
42
∘
+
x
=
180
∘
⇒
164
∘
+
x
=
180
∘
⇒
x
=
16
∘
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