Final answer:
An urban pattern is a constellation of cities around a main center, shaped by urban morphology and the social, political, and economic relationships within cities. Examples include the U.S. megalopolis and ancient Rome's city plan.
Step-by-step explanation:
Urban pattern refers to the constellation of cities around a main center. This concept falls within the field of Urban Geography. In urban areas, cities develop and grow as centers of social, political, and economic relationships. The layout and organization of a city, known as urban morphology, play a significant role in shaping the cultural, political, and social life of the city. Examples of urban patterns and constellations of cities can be seen in the U.S. megalopolis, a corridor encompassing multiple cities and their surrounding suburbs, as well as in ancient civilizations such as Rome with its standardized city plan.