Had the Earth been flat, a total of three satellites would have been enough to p...

Questão de Matemática da banca UERJ aplicada no concurso UERJ (2019). Confira a resolução completa abaixo:

Had the Earth been flat, a total of three satellites would have been enough to provide this information (l. 30-31)

In relation to the rest of the statement, the underlined fragment has the objective of: