Think of a plane as being a sheet of paper that goes on forever in all four directions. Coplanar means that they are on the same plane. Think of how you would draw two lines (which go on forever in two directions) on that sheet of paper so that they would never meet each other (not have a point in common)--you would draw two parallel lines.
parallel
True
coplanar
It is their intersection.
Coplanar lines that do not intersect (have no common point) are parallel.Two objects are coplanar if they both lie in the same plane, they must either intersect or be parallel.
Concurrent coplanar forces have their lines of action intersecting at a common point, allowing them to be resolved using the parallelogram law of forces. Non-concurrent coplanar forces have their lines of action not intersecting at a common point, requiring the use of the triangle law of forces for resolution.
a point
Parallel lines are a specific type of coplanar lines that never intersect and are always the same distance apart. While all parallel lines are coplanar, not all coplanar lines are parallel; coplanar lines can also intersect at some point. Therefore, while the two concepts are related, they are not synonymous.
-- They can be parallel, with no points in common, or -- They can intersect in exactly one point.
A point or, if the lines are also collinear, the line(s).
What is non-coplanar lines?
coplanar lines are lines lying on the same plan.