Boston is 7 times larger than Cambridge, Massachusetts.
Area: 129 km2 calculated
Boston is the capital and largest city of the Commonwealth of Massachusetts in the United States. Boston also serves as county seat of Suffolk County. Wikipedia
Area: 19 km2 calculated
Cambridge is a city in Middlesex County, Massachusetts, United States, in the Boston metropolitan area, situated directly north of the city of Boston proper, across the Charles River. Wikipedia