They need not be. The four vertices of a quadrilateral are coplanar but NOT collinear.
On the other hand, any line (in Eucledian geometry) has an infinite number of points on it - all of which are coplanar.
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Not necessarily. Coplanar means that points lie on the same plane whereas collinear means that points lie on the same line. Points on a plane do not necessarily lie along the same line.
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.
This is a geometry term. It's a point that does not pass or lie on the same line as another point.
It is a tranversal.
Yes, the opposite rays of vertical angles are always coplanar, so the angles are as well.