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Coplanar

Points or lines are said to be coplanar if they lie in the same plane.

Example 1:

The points P , Q , and R lie in the same plane A .

They are coplanar .

Example 2:

The points P , Q and R lie in the plane A and the point S lies on the plane B .

They are non coplanar .

Example 3:

The two lines P Q and R S lie in the same plane A .

They are coplanar .

Example 4:

The two lines P Q and U V are skew lines.

They are non coplanar .