113 nea:
deberetq́;
ita deſcribi angulus ille rectilineus, vt
ejus dimidium eſſet ab vna parte dictæ lineæ, dimi-
dium verò ab altera, ita procedendum erit.
ejus dimidium eſſet ab vna parte dictæ lineæ, dimi-
dium verò ab altera, ita procedendum erit.
Sit linea data AB:
punctum verò in ea datum ſit C:
angulus autem rectilineus datus, ſit DEF. Pedem cir-
cini immobilem figo in puncto C, cumq́; altero pede
portionem circuli deſcribo, quæ ſit PQ, qui arcus PQ
lineam AB ſecabit in puncto M. Iam, cum eadem cir-
cini apertura, deſcribo arcum ſuper angulo DEF, pe-
7[Figure 7]
angulus autem rectilineus datus, ſit DEF. Pedem cir-
cini immobilem figo in puncto C, cumq́; altero pede
portionem circuli deſcribo, quæ ſit PQ, qui arcus PQ
lineam AB ſecabit in puncto M. Iam, cum eadem cir-
cini apertura, deſcribo arcum ſuper angulo DEF, pe-
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