2D의 직교 좌표계를 좌표평면이라고 하나요?
A Euclidean plane with a chosen Cartesian coordinate system is called a "Cartesian plane". In a Cartesian plane one can define canonical representatives of certain geometric figures, such as the unit circle (with radius equal to the length unit, and center at the origin), the unit square (whose diagonal has endpoints at and ), the unit hyperbola, and so on.
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