Explain why the lines are parallel

Me with this one question, and i'll upvote the brainliest answer

The diagram shows a cuboid abcdefgh abcd is a square with area 25cm². find the volume of the cuboid.

The accompanying data represent the miles per gallon of a random sample of cars with a three-cylinder, 1.0 liter engine. (a) compute the z-score corresponding to the individual who obtained 42.342.3 miles per gallon. interpret this result.