What describes lines that intersect to form right angles?

Perpendicular lines are defined as lines that intersect at an angle of 90 degrees, which is a right angle. The key characteristic of perpendicular lines is this specific angle of intersection. When two lines meet in such a manner, it creates distinct geometric right angles, making it possible to identify one line as vertical and the other as horizontal or slanted, depending on their orientations.

In contrast, parallel lines do not intersect at all, as they remain equidistant from each other indefinitely. Skew lines also do not intersect; however, they are not parallel and exist in different planes. Coplanar lines can intersect or be parallel; thus they can include lines that intersect at angles other than 90 degrees, but this does not define them as perpendicular. Therefore, the defining feature of perpendicular lines is their intersection forming right angles.