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62. One righf' lined figure is inscribed In ar.- 

 hihery or the latter circurnscribes the firmer^ \/ "^ 

 when all the angular points of the former arc 

 j)laccd in the sides of the latter. 



63. Similar Jigures zre tho^Cy that have all the angles of 

 one equal to all the angles of the other, each to each, and 

 the sides about the equal angles proportional. 



64. The perimeier of a fgiire is the sum of all its sides, 

 taken together. 



65. A proposition is Something, which Is either propojJed 

 to be done, or to be demonstrated, and 19 either a probldni 

 or a theorem. 



66. A problem Is something proposed to be done. 



67. A theorem is something proposed to be demonstrated. 



68. A lemjia is something, which is premised, 6x pre- 

 viously demonstrated, in order to render what follows 

 more e^y. 



69. A corolktry is a consequent truth, gained immediate- 

 ly from some preceding truth, or demonstration. 



70. A scholium is a remark, or observation, made upon 

 something preceding it. 



PROBLEMS. 



