<prompt> Batlisisa ka bongata ba baahi ba toropo e itseng.Rio de Janeiro  <response>: Instruction in English: Research the population density of a specific city. . Response in English: As of 2021, the population of Rio de Janeiro city is estimated to be around 6.718 million people. The city has a surface area of approximately 1,255 km2 485 sq mi, resulting in a population density of about 5,353 persons per km2 13,862 persons per mi2. . Response in Sesotho: Ho tloha ka 2021, palo ea baahi ba toropo ea Rio de Janeiro e hakanngoa hore e ka ba batho ba limilione tse 6.718. Toropo e na le sebaka se boholo ba 1,255 km2 485 sq mi, se bakang palo ea batho ba ka bang 5,353 km2 batho ba 13,862 ho mi2. 