A plane is a flat surface defined by two lines, or by a line and a point not on the line.
A plane can be envisioned as an infinitely-large square sheet of paper that is perfectly flat and with no thickness whatsoever. However, curved planes can exist in higher forms of geometry.
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A plane is an infinite span in two dimensions. It is infinitely long and infinitely wide, but has no thickness. An approximation of a plane is a computer monitor. The Mouse, letters, and images interact, but only in two dimensions (up/down and sideways, where a diagonal can be expressed as a combination of up/down and sideways). Things on a monitor cannot be "in front" or "behind" one another, but merely drawn to give the impression they are.
The most common plane is the x,y Cartesian coördinate plane.
M.P board 12th maths chapter Plane
There is no such concept in maths. A plane figure is a mathematical concept but that is not what the question is about.
numbers, algebras, coordinate plane, geometry (shape, area, volume), calculus, theorems, and so on.
In maths x and y-axis divide plane into four parts these parts are called quadrants.
It means four sides, and refers to plane figures bounded by four straight sides.