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Academy: descriptive geometry, topic by topic

Descriptive geometry and the dihedral system explained topic by topic, with diagrams and constructions you can try in the 3D editor.

• What is the dihedral system?
• The line
• The plane
• Intersections
• Parallelism and perpendicularity
• Distances
• Angles
• Rotations into the projection plane
• Spins
• Changes of plane
• Polyhedra
• Curved surfaces
• Sections
• Nets
• Steepest slope and inclination
• Angles with the projection planes
• Characteristic positions
• Oblique solids of revolution
• The sphere
• Syllabus map

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