;S2 



GEOMETRY. 



5. LixiGs are either right, or curved, or 

 mixed of these two. 



"t6. a right liney or straight line, lies all 

 I in the same direction between its extrem- 

 ities, and is the shortest distance between 

 two points. 



7. A curve continually changes 

 its direction between its extrenie 

 points. 



8. Lines are either parallel, oblique, perpendicular, or 

 tangential. 



9. Parallel lines are always at the 

 same distance, and never meet, 

 though ever so far produced. 



I o. Oblique right lines change their 

 distance, and would meet, if pro- 

 duced, on the - side of the least 

 distance. 



II. One line is perpendicular to 

 another, when it inclines not more 

 on one side than on the other. 



12. One line is tangential^ or a 

 tangent, to another, when it touches 

 It without cutting, if both be pro- 

 duced. 



!l3« An 



