Final answer:
Brasilia is the city designed by Oscar Niemeyer and Lucio Costa, established as Brazil's capital in 1960, which features modernist architecture and sectors as part of its city planning.
Step-by-step explanation:
The city that was designed by Oscar Niemeyer and Lucio Costa, is divided into sectors, and was ordered to be constructed by President Juscelino Kubitschek is Brasilia. This planned city became the official capital of Brazil in 1960 and showcases Niemeyer's modernist architecture, which emphasizes curved lines and organic shapes.
Landmark buildings in Brasilia include the Cathedral of Brasilia, a hyperboloid structure with concrete columns, and The Palacio do Planalto, the executive government building known for its glass walls and tapering columns. Brasilia is known for its rapid growth since its establishment, evolving into a metropolitan hub with contemporary architecture that breaks from traditional designs.