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Mathematics
Problem
Two lines
k
k
k
and
l
l
l
are cut by a transversal
m
m
m
, forming interior angles
∠
A
\angle A
∠
A
and
∠
B
\angle B
∠
B
on the same side of
m
m
m
. Which of the following conditions is sufficient to conclude that
k
∥
l
k \parallel l
k
∥
l
? a)
∠
A
=
∠
B
\angle A = \angle B
∠
A
=
∠
B
b)
∠
A
+
∠
B
=
90
∘
\angle A + \angle B = 90^\circ
∠
A
+
∠
B
=
9
0
∘
c)
∠
A
+
∠
B
=
180
∘
\angle A + \angle B = 180^\circ
∠
A
+
∠
B
=
18
0
∘
d)
∠
A
−
∠
B
=
90
∘
\angle A - \angle B = 90^\circ
∠
A
−
∠
B
=
9
0
∘
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