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What is the main line called in the rectangular survey system that runs east and west?

  1. Baseline

  2. Equator

  3. Township Line

  4. Range Line

The correct answer is: Baseline

The main line in the rectangular survey system that runs east and west is called the baseline. This line is used as the starting point for the survey, and all other points are measured relative to it. The equator is a line of latitude, and is not relevant to the rectangular survey system. The township line and range line are also incorrect, as they are both used in the survey system but are not the main line that runs east and west.