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<center>ยง. III.</center><br />
''Linearum calculatio in Quadrato.''<br />
His praesuppositis, tandem ad linearum praecipuarum, quae in Munitionum Regularium Delineationibus occurruat, calculum Trigonometricum pergimus cum [[Name::Nicolao Goldmanno]], a Quadrato incipientes. Quam autem ratione in Quadrato procedimus, eadem in omnibus reliquis procedendum est, dum modo supponantur, quae in illis supponenda diximus. Itaque<br><br />
<center>''Primo''</center><br />
Ad inveniendas H G, & G C, consideretur triangulum rectangulum H G C, in quo omnes anguli sunt cogniti, & latus H C, assumptum pedum 240. Ex his reliqua latera H G, & G C reperiuntur per finus; H G quidem si fiat, ut finus totus ad H C, ita sinus anguli H C G ad aliud; G C vero, si fiat, ut finus totus ad H C, ita sinus anguli C H G ad aliud.<br><br />
<center>''Operatio pro linea HG''</center><br />
Sinus anguli H C G gradum 75 est 96593<br><br />
Hic multiplicatus per latus H C 240 000(3)<br><br />
Producit 23182320000<br><br />
Hoc divisum per finum totum 10000<br><br />
Producit latus H G 231823 (3)<br><br />
<center>''Operatio pro linea GC''</center><br />
Sinus anguli G H C gradum 25 est 25882<br><br />
Hic multiplicatus per latus H C 240 000(3)<br><br />
Producit 6211680000<br><br />
Hoc divisum per finum totum 10000<br><br />
Producit latus G C circiter 62117 (3)<br><br />
<center>''Secundo''</center><br />
Ad invenienda A F, & C F, consideratur triangulum rectangulum C A F, in quo omnes anguli sunt cogniti, & latus A C datum pedum 60. Ex his latus A F per Tangentem, & C F per Secantem anguli A C F reperientur; A F quidem, si fiat ut sinus totus ad C A, ita Tangens anguli A C F ad aliud; C F vero si fiat, ut sinus totus ad latus C A, ita Secans anguli A C F ad aliud.<noinclude><references/> {{TurnPage}}</noinclude></div>Irene Pedretti