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Every plane has 3 or more. There is a projective (or affine) plane with only 3 points.
You do not have 3 coordinates in the Cartesian plane. The Cartesian plane is a plane and is therefore 2 dimensional. In 2 dimensional space you require only 2 coordinates. 3 coordinates are required to locate a point in 3-dimensional space but then it cannot be a Cartesian PLANE.
No, plane geometric figures are ones like triangles and circles that can fit completely in the plane. A cylinder needs 3, not 3 dimensions and will not fit in the plane.
cartasian plane off the coordinite plane is 2x+3=n that sould be the equations
A plane figure is 2-dimensional.