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английский) 2:
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Cartesian coordinate system in the plane is defined as follows. Take a plane two mutually perpendicular numeric axis 0x and 0y, have a common origin point 0 and the overall scale unit.
Axis 0x and 0y form a rectangular (Cartesian) coordinate system in the plane.
The projections of the point on the plane on the coordinate axes, or rather, their numerical values They called rectangular or Cartesian coordinates of the point on the plane.
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