Question

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Answer 1

4: The lines are not parallel.
5a: Alternate interior angles are 1 & 2 OR 3 & 4.
5b: A pair of congruent angles are 2 & 3 OR 4 & 1.

Explanation:

A line intersecting two parallel lines will have equal angles at each crossing. Thus, the two lines shown are not parallel.

Interior angles are on the "inside" of a curve or surface creating the angle. Alternate means one after the other.

Congruent means with the same value. In this diagram we are assuming that the periscope tube primary bends are `90^o` and the tube walls are parallel.