How many miles did the Qin dynasty
encompass at its height?

The outside is 16 feet (5 meters) high from the outside, and the inside is 7 feet (5 meters) high.

Explanation:

Qin Dynasty was the first unified, multi-national and power-centralized state in the Chinese history. It lasted from 221 BC to 207 BC. Although surviving only 15 years, the dynasty held an important role in Chinese history and it exerted great influence on the following dynasties.

The Qin empire is known for its engineering marvels, including a complex system of over 4,000 miles of road and one superhighway, the Straight Road, which ran for about 500 miles along the Ziwu Mountain range and is the pathway on which materials for the Great Wall of China were transported.

It has a total length of 7.5 miles (12 kilometers). The wall is 3.4 yards (3.1 meters) wide at the bottom, and 3 yards (2.8 meters) wide at the top. The outside is 16 feet (5 meters) high from the outside, and the inside is 7 feet (5 meters) high.