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Orthographic projection
Primary auxiliary views
Lines
Planes
Successive auxiliary views
Piercing points
Intersection of planes
Angle between planes
Parallelism
Perpendicularity
Angle between line and oblique plane
Mining and civil engineering problems
Revolution
Concurrent vectors
Plane tangencies
Intersections of planes with solids
Developments
Intersections of surfaces
Shades and shadows
Perspective projection
Conics
Map projection
Spherical triangles.

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