122 DE RESOLVT. POLYGON. RECTIL. 

 hinc fi ponatur 



confequea.iir 



Tang. [ (B + K) = cot. lE^j^.V ^^^. 

 Vel ctiam facilius forraii hcc modo , llatuatur 



^^'^-:^-coCM% vt fit {c+dy^i.ed{:in.iE'=:ie+dyanW. 

 (jf+a) 



critque hinc 



Tang.|(B+K)'--^ ^""'^ 



(<f H- <•/)• fin. M*- (« - '^y 



Tnde Tang. i(B + K) fatis commoie cxprimitiir. 

 His igirur formulis adliibitis rcfolutio Pentagoni fa- 

 cile abf^luitur , et pro Polygonis ahiorum ordinum 

 regulae his fimiles facile inuc.niri poffunt > quibus 

 exponendis immorari non cft neccflc. 



OBSER- 



