De is the length of the plane. Dr is the height of the plane. So it is impossible to make the length of the plane smaller than the height of the plane. This is why De is always greater than Dr.
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point B lies in plane U
De Morgan's theorem is used to help simplify Boolean Expressions. Digital Circuits can be simplified by the application of this theorem.
The answer is 52.34
The Tour de France bicycling event is a challenge even for experienced cyclists.