1平方公里是多少平方米？

1平方公里（km²）是一个常用的面积单位，特别在地理学和城市规划中经常被使用。它表示一个正方形区域每边长为1千米的面积。换句话说，1平方公里等于100万平方米。

在现代都市化进程中，人们越来越关注城市的规模和发展。以平方公里为单位的面积可以帮助我们更好地理解和比较不同城市之间的大小和密度。例如，纽约市的总面积约为783.8平方公里，而上海市的总面积约为6,340.5平方公里。通过比较这两个数字，我们可以清楚地看到上海市相对于纽约市的巨大规模。

英文翻译对照：

1 square kilometer is how many square meters?

1 square kilometer (km²) is a commonly used unit of area, particularly in geography and urban planning. It represents the area of a square with each side measuring 1 kilometer. In other words, 1 square kilometer is equal to 1 million square meters.

In the process of modern urbanization, people are increasingly concerned about the size and development of cities. Using square kilometers as a unit of measurement can help us better understand and compare the size and density of different cities. For example, the total area of New York City is approximately 783.8 square kilometers, while the total area of Shanghai is approximately 6,340.5 square kilometers. By comparing these two numbers, we can clearly see the enormous scale of Shanghai relative to New York City.