The set of all points (x, y) such that (x − 1)² + y² = r² is a circle of radius r around the point (1, 0).
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circle
/ˈsɜɹkəl/noun · B1
MAIN MEANING
B1원
A two-dimensional geometric figure, a line, consisting of the set of all those points in a plane that are equally distant from a given point (center).
Kreis원
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