1. On the Burning Mirror1
  2. Conics2
  3. Cutting off a Ratio 
  4. On the Cylindrical Helix 
  5. Quick Birthing 
  6. Plane Loci 
  7. On Verging Constructions 
  8. Tangencies3
  9. Cutting an Area 
  10. On Determinate Sections4

1. Parallel beams of light hitting a spherical mirror do not converge at one point. 

2. All cuts as sections, at different angles, of the same cone…

3. A circle passing through the given points…

4. The points on a line must satisfy a given ratio.