1. What is the subject-matter of Book VI.? Ans. Application of the theory of proportion.
2. What are similar rectilineal figures?
3. What do similar figures agree in?
4. How many conditions are necessary to define similar triangles?
5. How many to define similar rectilineal figures of more than three sides?
6. When is a figure said to be given in species?
7. When in magnitude?
8. When in position?
9. What is a mean proportional between two lines?
10. Define two mean proportionals.