14. Give another definition.
15. Define triplicate ratio.
16. What is proportion? Ans. equality of ratios.
17. Give Euclid’s definition of proportion.
18. How many ratios in a proportion?
19. What are the Latin terms in use to denote some of the Propositions of Book V.?
20. When is a line divided harmonically?
21. When a line is divided harmonically, what are corresponding pairs of points called? Ans. Harmonic conjugates.
22. What are reciprocal ratios?
23. Give one enunciation that will include Propositions xxii., xxiii. of Book V.