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Byju's Answer
Standard VI
Mathematics
Exterior Angle Property
If the opposi...
Question
If the opposite interior angles of an exterior angle of measure
123
°
is
x
and
x
+
3
, then
x
=
A
40°
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B
60°
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C
80°
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Solution
The correct option is
B
60°
By exterior angle property of a triangle, we must have,
∠
A
B
D
=
∠
A
+
∠
C
i.e.,
x
+
(
x
+
3
)
=
123
∘
⟹
2
x
=
120
∘
⟹
x
=
60
∘