In Figure, if
,
and
, find
.
Solution:
and
, it means that
{If line is parallel to two given lines then two given lines are parallel to each other}
It is also given that
Let,
and
(1)
(Alternate interior angles because
)
Therefore,
(2)
(Co-interior angles,
) (3)
Putting (1) and (2) in equation (3), we get
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