5(ximutl) M '^iinct^ L, unD fein 5(bj}ant) Don (Bd)citcl ZL ift bc^ 

 jtimmtA tt)enn man Dcö ^|^unctö L 5eoörnpl)ifc^e 55rci(c AL = %p 

 »ciör t)a LPZ tJec (Stunden '2ölnfcr = 9o° — 7 i|T, 5!}?an l)at 

 n^m(ic5 im fpr>U*ifc]^cn S^repecf LPZ Die (Seite PL=:9o''— -f, 

 «nö W ^rfldnxung &ev ^ofl)6l)e ZP = 90°. 5((fo fang. PZL 



= In PL finLPZ ^ co^c^lV =,,,,„g, KT W, «nö cofP .=cofESZ 



col PL 11 nv 



finPL = finy cof-4^. (Se^t man nun ä: = TF = rcofNj' , 1; = FE. 



= ffinv^, fo crl)öft man rcof^^= .^1^ ,»-finN^= Ü^^Z'i-,. 



/•C0I7— tiiny rcoPy—tfiny* 



J^Uxm mt = '^'tS^pL, u = -':^~ , aifo » = wx 



n-col-vi'uny j+cof+'fin'y " « TW 



= «ang'KTW = -^-,- , unb cot. KTW = SSL^^^l , wit 



t)orl)in , unö vitt+ uu) = TK = *-^ (fi""^^ + cof> j^^ cofy^) 



«. « n- cof4^ finy 



_rv/(i— cof-4'^fin'y=)_ rfinZL , .^r .x v 



T^^-üny IT^ZL = '^'"S^^L, me uac^ Um 



li §. ci:forDe« wiift»» 



S5ie ©feic^ung för bie ortl)05rapI)ifc^e ^to/ectfon ergicbt 

 fic^ jo. ^an fe^e in Den ^ormuln fuc t)ie o«()Oflrapl)if(^e *5>ro^ 



jection beöio §, ^ict J=r,i =0,;^=: 7,^=90°, fo wirb a:=-J-_ 



coly, 



«nb if =«, S)ic§ in ^rar + «/t; = rr gefegt fliebf — ^*— + «» = rr, 



cot7^ 

 ober «t + uuco^y^ = rrcoPy ^^ . ^ut uzzio, ifl t=+ rcofy = TB, 



unb ftür <=o, tt)itb a=+f = TP, ?0?an fe^e arfo rcofy.^ TB, 

 fo wirb cof7 = T?, unb «+ — -»»=TB% obet «=TB='-~-^M«^ 



