skæringslinjer
Skæringslinjer, in a geometric context, refers to the points or lines where two or more geometric objects intersect. This can apply to lines, planes, curves, or surfaces. When two lines intersect, they typically meet at a single point. If the lines are parallel, they do not intersect and have no skæringslinjer. Coincident lines, which are essentially the same line, intersect at infinitely many points.
In three-dimensional space, the intersection of two planes is a line. If three planes intersect, their skæringslinjer