DelMonte, Guidubaldo, In duos Archimedis aequeponderantium libros Paraphrasis : scholijs illustrata

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1huius figuræ inſcriptæ angulos, qui ſunt vertici
portionis proximi, eoſquè deinceps coniungen­
tes, baſi portionis æquidiſtantes eſſe; bifariamquè
à diametro portionis diuidi; diametrum verò in
proportione diuidere numeris deinceps impari­
bus.
vno deno minato ad verticem portionis. Hoc
autem ordinate oſtenſum eſt.
SCHOLIVM.
Scopus Archimedis in hoc ſecundo libio, vt initio primi
diximus, eſt inuenire centrum grauitatis paraboles.
& vt de­
ducatnos in hanc cognitionem, quadam vtitur figura rectili­
nea in parabole inſcripta, quę plurimùm conducit, & eſt tam
quam medium ad inueniendum hoc grauitatis centrum.
his
igitur verbis docet, quo modo in parabole in ſcribenda ſit hęc
figura; in quibus multa quo 〈que〉 proponit tanquam ſit pro­
poſitio quædam; in qua multa ſint oſtendenda.
quorum ta­
męn demonſtrationem omiſit, ac tanquam ab eo alibi de­
monſtratam.
Horum autem ex Apollonij Pergęi conicis
demonſtrationem elicere quidem potuiſſemus.
at quoniam
Archimedes ipſe non nulla ad hæ cſpectantia alijs in locis de­
monſtrauit ideo Archimedem per Archimedem declarare o­
portunum magis nobis viſum eſt.
Sit portio contenta recta linea, rectanguliquè coni ſectio­
ne ABC, cuius diameter BD. Iunganturquè AB BC, diuida­
tur deinde AB bifariam in E, a quo ipſi BD æquidiſtans

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