What is the size of the capital city of Lilliput?

The capital city of Lilliput, as described in "Gulliver's Travels," is indeed depicted as a square measuring 500 feet on each side. This square shape makes it both an organized and compact space for the inhabitants, emphasizing the unique perspective provided by Swift through the lens of Gulliver, who, being a giant in Lilliput, finds himself in a world where everything is diminutive compared to his size. The choice of a square layout reflects a structured approach to urban planning that aligns with the rigid societal order of the Lilliputians.

The other options are not accurate representations of the city's dimensions as described in the text, which is vital to understanding the contrast between Gulliver's massive size and the tiny town around him, as well as the overarching themes of perception and perspective in the story. The square's edges and corners also symbolize the rigidity of Lilliputian society, making the correct answer particularly meaningful in the context of Swift's satire.