-»S=>i ) 180 ( :?.c?<. 



f, i6. lam vero notetur cfle 



p p z^ 1 -\- 2. cof. g co(, ^ -4- cof. g' cof. ^' et 



q q — [i - Qoi. g') {i ~ Qo(. h') , 

 confequcntcr 



p p — q q — cbf. g' -H cof /7-^-2 cof. g cof. h , ec 



y (p p - ^ <? ) — cof g H- cof. Z? . 

 Tum vero eft 



p - ^ =1 I -i- cof (g -I- y^) r= 2 (cof ^-•tA)» et 



p -j- </ — I + cof. (g — b) — 2 (cof -^-^f-^)* , ideoqut 



yP_-_. ^ '-^^^ . Denique eft 

 ^-»-« co(. ^g-/?) ^ 



His omnibus fubftitutis obtinebitur hacc rclatio inter S etx: 



o \ cof. ] (g -{- h) , - 



S — z Arc. tang. ^^ tang. ; j, fiue 



co(. ^g-^j 



, p cof. Ug -]- h) 

 co(. ^ (g - ^) 

 cnins ope pro qnnuis pnndo v par.illeli cuinscunqne puuc- 

 tum ipfi re(pondcns V in proie(flione definiri poterir. 



^ab. V. §. 1-7. Sit Zj — o, crit polus in pundo A, quo 



^'^o- '• cafu , vt fupra vidimus, paralicli proie<fti luiit circuli con- 



ccntrici. Hoc ergo cafu crit tang. ^ S — tang. j j, fiue 

 S :z; J, hoc cft Y A^Zj —y q Zy vti requnitur. 



Tab. VL §. 18. Sit pe — pf—g — 90*i erit ^/ acqnator, 



% 3- pro cuius proiedione eft - 



AP 



