Mathematics, what is the shortest vertical line segment?

The shortest vertical line segment is a theorem.

If the point P outside the straight line L is perpendicular to the straight line L and the vertical foot is marked as O, the line segment PO is called the point P from the point to the straight line.

The vertical part of l.

Of all the line segments connecting the outer point and the point on the line, the vertical line segment is the shortest. It is called "the shortest vertical line segment"

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Jing you Chu Wang er mathematics