POLYGOXORVM RECTILlNEORVM lox 

 a fin. B — r fm. C 



Dcnique ob 



d d -{( a - c) ^m.\[V, ^ Q) - b dn. \ {B - C))* 



+ ( ( fl H- O cof ■ ( B + C ) + Z; cof.i ( B - C ) f 

 il quaenuur 



T ..A T^^ ^^-^)fi"-'(B+C)-/>rin.:(B-C) ^ 

 Tans..(A-D)==^^^j^— — — — , fiet 



_ (^-Orin.KB-^-C)-^rin.KB-C) 

 ftii. i(A-D) • 



1(5. Problcm;! IL Daiis hueribus a, b, d et an- 

 gulis B, C inuejligare rehquos angulos A, D 



Qiiia hoc cafu anguli A, D in difpnri funt ra- 

 tionc (ufficiet altcrutrum corum quaeriuifle , angii- 

 lus autcm D facillime inuenietur per hanc formulam 



fin. D — ^ -^"'- ^ - ^-^ ^^^^' , quo inuento crit 

 Ar=36o'-(B4^C + r) ct ,- — i£!i:JL-=|i^: i£=hDJ 

 vcl fi placct 



frr-^cor.C-^cor.(C+B)-^co(:(CH-B-f-D). 

 Siquidem \ero angulus D duplicem rccipit valorcm, 

 li.juet omnino pro c binos quoquc prodirc valores. 



17. Problcma IF. Datis lateribus a, c, d et an^ 

 gulis B, C inuenire anguhs A, D ^^ latus b. 



Pcr aequationem quartam habebimus pro hoc 

 Probkmate 



flfi^.B-HflTin.^AH-B^-f-fin.Czro, ex quo colligimus 



N 3 fin. 



