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Mathematics
Mathematics
Problem
Road
AB
\text{AB}
AB
and road
CD
\text{CD}
CD
are intersected by road
EF
\text{EF}
EF
. The angle between
AB
\text{AB}
AB
and
EF
\text{EF}
EF
on one side is
68
∘
68^{\circ}
6
8
∘
. The angle between
CD
\text{CD}
CD
and
EF
\text{EF}
EF
in the corresponding position is also
68
∘
68^{\circ}
6
8
∘
. Are
AB
\text{AB}
AB
and
CD
\text{CD}
CD
parallel? Give a brief reason.
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