POLYGOXORVM RCCriLTNEORVM. 89 



caetcrum vt commodiiis detcrminari qucat angulus D, 

 feqiieiite^ ai^i brc licet transform.uioiics : 



pcr qtiam fit 



!L {d -c)" -^ ^cdcof.yh' -(ia-b)" -^ ^a bcoC'^B\ 

 ex qua colligitur : 

 coCliy-^-^JX^-b-^-d-c^^a-b-d-^-c^i-^abcof.lBy 



hinc 



\ Jc-hd+a-\-b)(c-{-(f-a-b ) A 4-o bCm \V^ 



vel potius (i placet iftas 



1 (d-\-cf-^c(iCin.yD"—{a-bf-h^abcof.lB\ 

 ^cdCia, s U*—Cd-\-c-]-a-byj-i-c-a-\-b)-^abcoi.lh'i 



IL id-cf-\-^cdcoL'iU' — [a-\-by-^ab[m.[ B\ 

 CX quo 



j\c dcoi. 'jy-^a + b-^-d- c){a-\- b - d-\-c)- ^ab {'in.lT^"; 

 tumque vcro 



, __ (J d-^-c - ^-a-h^^d-^-c-a + b^ -^abcof. : B* 

 t2ns.',D -(^a-\-b-rd-7j~(^-\-b-d\rC'}-^ab^,W' 

 Ponatar nunc 



4^^cor:B' 



tan:i. 0' — 



((i-t-c-\-a-D}^a-\-c-a-\-b)* 



4-abC\n :B' 



tane. -yi :=: , : 



{a-f-b-\-c — iiy^u-\-o>-\-u-c} 



Tom.XX.Nou.Comm. M erit- 



