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   Definition of an angle between two skew lines.
   Definition of a perpendicularity of lines
   Definition of a perpendicular from a fixed point to a plane.
   Definition of perpendicular planes.
   Definition of an angle between an oblique and a plane
   Definition of a dihedral angle.
   Definition of an angle between planes
   Theorem 1 (Test for perpendicularity of a st. line to a plane)
   Theorem 7 (Of the three perpendiculars)
   Theorem 8 (The test for perpendicularity of a plane to a plane)
   Theorem 9
   Theorem 11
   Theorem 12
   Theorem 13a
   Theorem 13b
   Problem 1
   Problem 2
   Problem 3
   Problem 4
   Problem 5
   Problem 6
   Problem 7
   Problem 8
   Problem 9
   Problem 10
   Problem 11
   Problem 12
   Problem 13
   Problem 14
   Problem 15
   Perpendicularity of Straight Lines and Planes. Movie.
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