I cant see anything there needs to be more to the question
Answer:
Parallel: G and F
perpendicular: G & H, F & H
Step-by-step explanation:
G and F are parallel because they will never cross, where as both are perpendicular to H because they intersect at 90°
Yes, there is a type of triangle called a "3 4 5 triangle" with side lengths 3, 4, and 5.