the fourth proportionall which wasrcquired,and if it be meafured with the other lines,it dialbe 75 ,as before. In both thefe manner of operations, the two firft linesdo feme to ope the Se&or ro his due angle, the differencebetweene them is efpecially this, that in pwtlkll entrance,the two lines… … Now in fimph folat!*H which is begun and ended^vponthe fame kinde of linesyit is allone which of the two latterlines be put in the fecod or third places. As in our exaplcwe may fay->as 40 are to 50, fo Co vnto 75,or elfe as 40 areto tfo, fo 50 vnto 75. And hence it cometh that we mayenter both…
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