Answer:
Explanation:
Any two points are always coplanar. Any three points are always coplanar. Four or more points are coplanar if they all are present on one plane. Two or more lines are coplanar if they all are present on one plane.
1. If there are three vectors in a 3d-space and their scalar triple product is zero, then these three vectors are coplanar.
2. If there are three vectors in a 3d-space and they are linearly independent, then these three vectors are coplanar.
If two lines are coplanar, then both lines lie in the same plane. Therefore all the points on each line must also lie on the same plane.