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A plane is a flat surface with no thickness. It is also one of the undefined terms in mathematics which extends indefinitely in all directions.
In mathematics, a plane is a flat, two-dimensional surface.
Examples:
triangle
square
circle
Walter Fleming has written:
'Plane trigonometry' -- subject(s): Plane trigonometry
'Precalculus mathematics' -- subject(s): Mathematics, Precalculus
quadrant in mathematical terms is a section on a Cartesian plane there are 4 quadrants on a Cartesian plane
There are more solutions in a half plane