A perpendicular line segment requires two folds when using the paper folding method.
Lines that intersect each other forming a right angle are called perpendicular lines.
Example: the steps of a straight ladder; the opposite sides of a rectangle.
Perpendicular line segments are line segments that intersect at a 90-degree angle. This can include any two line segments that come together as long as the angle they cross at is 90 degrees. They are special because if one angle is 90 degrees then all four of the angles between the line segments are 90 degrees.
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