Marks' first lessons in geometry / In two parts. Objectively presented, and designed for the use of primary classes in grammar schools, academies, etc.

by Bernhard Marks

By means of Fig. C, prove that

9. a c n equals m c b, by means of a c m.

10. a c n equals m c b, by means of b c n.

11. a c m equals n c b, by means of a c n.

12. a c m equals n c b, by means of m c b.

By means of Fig. D, prove that

13. m c a equals b c n, by means of a c n.

14. m c a equals b c n, by means of m c b.

15. m c b equals a c n, by means of m c a.

16. m c b equals a c n, by means of b c n.