IN 



' rife 



4. The rerUoee are : (1 V3, 0). (0. Ivfy, (-SVI, tvfl); andtheeojaa- 

 lions of the skies are: B + yvtVI, l*-f f SV30, *-f 



Page 119 Art. 69 



S. 

 I. 

 4. 



Page* 119-122 BmnplM on 

 l Tb* third twtex to (I J V8, 2>/3); equaikm of the two rid* an* 



2. The area to 18 and the fourth vert** b at any one of the Mlowing 

 point* : (3, -6), (7. 1), <-| f I 



S. 8y-4z = 9, and y - 3 = 0. . y = 3z. t. J8z 4 28* = 11. 

 T. y=(2V3>TVi. t. Ox-7f as I, or 7* + 9y78. 



11 If the btM be choeen T iTto, and Its tnMdte point M 

 the equation of the loot* of the vertex U ax - = 0. 

 U. ix-6^7 = 0, x-F = 1 ; 11:1. 



13 



U. 4%/o3(f-Sx+ ll)=3>/O(7x-2f , 



IT x + jf = 2a, orx-Hf = 4o. U (^ % *)&**, ^-, tn the 

 fint line for = * (when = 0. 1, 2. ...). in the eeeood line for 



the first line to parallel to the polar axis, the second line makes an angle of 

 00 with the polar axis ; the lines make an angle of 60* with each other. 



19. y = Vf + 8-vfc iO :.r + Sy + 40. 11. 



tt. Center to H, '-j\. radios to ; 





