Most visitors to this site keep a pretty close watch on their system. When a new user account suddenly appears on the system it's no surprise it's a matter of concern and raises more than a few questions. It turns out UpdatusUser is part of the NVIDIA driver package for their graphics cards.
Coplanar Lines. Coplanar Lines are lines which lie on the same plane. Two parallel lines or two intersecting lines always lie in a plane. Thus, two line are coplanar, if and only if they are either parallel or intersecting. Lines in three dimensional space are coplanar, only if they are not skewed lines. Two lines which are neither parallel nor intersecting are called skewed lines.
Two lines are parallel if and only if the two angles of any pair of corresponding angles of any transversal are congruent (equal in measure). Note: This follows directly from Euclid's parallel postulate. Further, if the angles of one pair are congruent, then the angles of each of the other pairs are also congruent. In our images with parallel lines, corresponding angle pairs are: Î±=Î±1, Î²=Î²1, Î³=Î³1 and Î´=Î´1.