

geometry; 



-=s.a®®^j<^S^gS5>!'©e®« 



DEFINITIONS, 



I. J\. POINT is that, which has position, 

 but not magnitude. 



2. A /hie is length, without breadth or 

 thickness. 



3. A surf ace f or superficies, is an 

 extension, or a figure, of two dimen- 

 sions, length and breadth, but with- 

 out thickness. 



4. A bocly, or solid, is a figure of three 

 dimensions, namely, length, breadth and 

 thickness. 



\[ 



Hence surfaces are the extremities of solids ; lines the 

 extremities of surfaces 5 and points the extremities of lines. 



5. Lines 



'"^ A Tutor teaches Simson^s Edition of Euclid's ElE" 

 MwNT^ of Geometry in Harvard College, 



