26 SUI.NVI: ABSOLUTE OF SPACE. 



_JL -=*, and 

 nat. log I 



1=^=2.7182818..., 



which noted quantity shines forth here also 

 If obviously henceforth * denote that sect 

 which the I=e, we shall have 



ri tan z. 

 But ( 21) Oy=2*r; therefore 



__j_ (Y-Y- 1 ) (by | 24). 

 &quot;at. lo Y 



8 31 For the trigonometric solution of all 

 rieht-angled rectilineal triangles (whence the 

 resolution of all triangles is easy , in S, three,., 

 equations suffice : indeed (a, 6 denoting the 

 Bides, C the hypothenuse, and , ? the an-K &amp;gt; 

 opposite the sides) an equation expre 



relation 



l&amp;gt;t, between a, c, *; 



2d, between a, &amp;lt;/, ,5; 



.M!, between a, b, c\ 

 of course from these equations 

 emerge three others by elim 

 ination. 



Kmm ^ 25 and 30 



^ / /^ . f~* i \ I A A ) 



* * 1 11 / :rrz v ^^ ^^ / * V&quot;^^ 



= [ T-^rl * LT-JT] (equation for c, a and .). 



