Perpendicular - Wikipedia

File:Perpendicular-Base-Hypotenuse Right Triangle.png - Wikipedia

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What is the relationship between three skew lines? - Quora

What is the difference between parallel and skew lines? Can you give some examples of each? - Quora

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The diagonals of a convex quadrilateral are perpendicular. If AB=4, AD=5, CD=6, then length of BC is ___? - Quora

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File:Perpendicular-bisector-1.jpg - Wikipedia

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