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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.
Answer:
1. Noah should draw a line from the left end of the 4 cm line up till it hits the angled line.
2. Noah could flip the triangle
Step-by-step explanation: