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Mathematics
Problem
Ray OX stands on a straight line AB, forming the adjacent angles ∠AOX and ∠XOB. Which relation between these two angles is always true? a)
∠
A
O
X
=
∠
X
O
B
\angle AOX = \angle XOB
∠
A
O
X
=
∠
X
O
B
b)
∠
A
O
X
+
∠
X
O
B
=
90
∘
\angle AOX + \angle XOB = 90^{\circ}
∠
A
O
X
+
∠
X
O
B
=
9
0
∘
c)
∠
A
O
X
+
∠
X
O
B
=
180
∘
\angle AOX + \angle XOB = 180^{\circ}
∠
A
O
X
+
∠
X
O
B
=
18
0
∘
d)
∠
A
O
X
−
∠
X
O
B
=
180
∘
\angle AOX - \angle XOB = 180^{\circ}
∠
A
O
X
−
∠
X
O
B
=
18
0
∘
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