Which of the following possibilities will form a triangle?
2 answers:
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2. 
(this is given in the first sentence)
3.
and 
due to ...
7. ... the alternate interior angles theorem (which holds because
and 
are parallel)
8. Because the above establishes that
, which means 
, which in turn means 
is a parallelogram.
3.
7. ... the alternate interior angles theorem (which holds because
8. Because the above establishes that