Question

Противоположное слову круг

Answer 1

Квадрат
или прямая
....

Answer 2

Opposite of "круг"

The opposite of the word "круг" is прямоугольник (rectangle) in Russian.

This information is based on the search snippet from Source which states: "Противоположность круга – прямоугольник."

Therefore, the opposite of "круг" is "прямоугольник" according to the search result from Source