Table of Contents

1. Perpendicularity and Projection
   1. 1.1 Perpendicularity of a Line and a Plane
   2. 1.2 Perpendicularity of a Vertical Edge of the Cuboid
   3. Shadow and Projection
2. Projections of Cuboid Diagonals
   1. Projections: Worksheet and PowerPoint
   2. Projection of Space Diagonal of the Cuboid: Example
   3. Projection of the Cuboid Diagonal: Q1
   4. Projection of the Cuboid Diagonal: Q2
   5. Projection of the Cuboid Diagonal: Q3
   6. Projection of the Cuboid Diagonal: Q4
   7. Projection of the Cuboid Diagonal: Q5
   8. Projection of the Cuboid Diagonal: Q6
   9. Projection of the Cuboid Diagonal: Q7
   10. Projection of the Cuboid Diagonal: Q8
   11. Projection of the Cuboid Diagonal: Q9
   12. Projection of the Cuboid Diagonal: Q10
   13. Projection of the Cuboid Diagonal: Q11
   14. Projection of the Cuboid Diagonal: Q12
   15. Projection of the Cuboid Diagonal: Q13
3. Angle between a Line and a Plane
   1. Angle between a Line and a Plane
   2. Angle between a Line and a Plane 投影與線面角
   3. Angle between a Line and a Plane: Worksheet and PowerPoint
4. Angle between 2 Planes
   1. Angle between 2 Planes
   2. Angle between 2 Planes: Worksheet and PowerPoint