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Coplanar
Points or lines are said to be coplanar if they lie in the same plane.
Example 1:
The points , , and lie in the same plane .
They are coplanar .
Example 2:
The points , and lie in the plane and the point lies on the plane .
They are non coplanar .
Example 3:
The two lines and lie in the same plane .
They are coplanar .
Example 4:
The two lines and are skew lines.
They are non coplanar .