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Vertical lines in space run perpendicular to the horizon. The very definition of perpendicular requires that the lines be at right angles to the horizon, so all lines that meet that definition are perpendicular.
Perpendicular lines form right angles at their intersections.
Perpendicular lines intersect to form right angles
right angles
4 perpendicular lines (Assume that it is perpendicular)----> # 2 lines intersected made 4 right angles. 4 lines make 16 right angles. 4*4=16