When constructing a perpendicular line through a point on a line, how can you verify that the lines constructed are perpendicular?
check the angles used in the construction with a straightedge to ensure consistency.
check the distance along the lines at several places with a compass to ensure they are the same length.
check the intersecting lines with the corner of a piece of paper to ensure the lines create 90° angles.
check the distance between the lines at several places with a compass to ensure they are equidistant.