w N E =r 90°, et ;« E N = ^ C /) — j3''. Hinc habemns 

 N </ :^ E ^ — E N := E- »; (A _ cof. B') -f- ^-^ 



= E:»7 fin. (3"'. '"5^'^-f-' -h :!L^r:Z!i_P_ , q m. 



Simili modo reperitur D E zz: — • ^ ^- , proinde 



'•c-.:9 r- '^ Q. ^ 



D N = ^^^^ -h E w cof. G^ = A . w Q 



t Q_ ' C Q^ • ^ ■ -- ^ 



■' .^— E;«(A_cor.[30, 

 aut 11 ponatur ^Q=z:aa, q m :^t ^ erit 



D j^ _ m:s+/m^j3- /2 a _ A _ E ;« fin. B.' ^VL^JiJh^f^ , 



Hinc fit 



N fl' . N D zz: _^-^i__ ■[(/«' s°- _ fin"'-. f^O (2 a ? — f 



-i- E ;« fin. p' (;;f s^fin. |3^ — ws coC (3^— fin. (3') (2 «— Y) 



— E w fin. (3^ (;;;" s* fin. (3^ -4- ;;; z cof.' p" — fin. (30 C 



— E ttf fin." (3' (;«" 2^ fin.* (3^ — i)] 



— -— i— -1 [(w^s= — fin.^^pOK- a — ' • 

 -f- 2 a . E m fin. i^' (m' z' fin. (3^ — ;;/ s cof.* (3''— fin. (30 



— 2E;«fin."-(3^(;;^^s"-— i)^ — E;«"fin.^ (3'(wf2"-fin."(3'— i)]. 



Quo nunc eliminari poffit linea E ;;; , confiderctur tri- 

 angulum folidum M w N E circa centrum E , in quo angulus 

 folidus ad Ew 1^^:90°, ad E N =r: a , et hedra ^E^=(3^, 

 unde erit tang. M E ;;/ rz: fin. (3^ tang. a , ideoque in triangulo 

 EwMad m redangulo, 'Em -=z —^ , feu pofito Mw = «, 



'-' ' /m. p' tang. a ^ ^ ' 



"E m ^zu cot. acofec.(3''. Quo valore loco E m ia aequatione 

 modo inventa fubftituto , habemus 

 uu^m* fin.^a.N^. ND 



~^l^±-^ [(w^s"— fin."(30K2a — 0-*-2«cot.a(»;'2*fiu.(r 



— mz cof.^(3'' — fin.(30 « — 2cot.afin.(3' {m''^^— i) k J 

 — cot.' a (w* z* fin." (3 — - i) « «J , 



R 3 ^en 



