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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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