Parallel or Not? Quick Check for Skew vs. Parallel Lines (V2)

This GeoGebra example visually investigates how two space lines behave as their defining points are arranged or moved, demonstrating whether they are parallel or become skew (non-intersecting and non-coplanar). It centers on the geometric classification of line positions in 3D, especially the ideas of parallelism via consistent direction and skew lines as the alternative when lines do not intersect and do not lie in a common plane. The construction uses the commands listed in the construction summary—PointIn, Line, and Plane—together with objects such as a, A, B, f, C, p, g, D, h, q, r to create key points and lines, then build planes for coplanarity checks. Suitable for upper secondary students and early university learners to support solid-geometry lessons, exploratory practice, and interactive demonstrations of spatial reasoning.