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t. I (PL 63)

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,327<br />

AN. MANL. SEV. BOETII<br />

Si circuhim linea recta contingat, a contactu vero A Intra datum circulum quadratum aliguod descri-<br />

in circumferentia qusedam circulum secans, linea bere utile est.<br />

recta ducatur, quoscunque angulos facit, duo anguli<br />

quisuntin alternis circuli portionibus, sunt aequales.<br />

Ex hoc igitur manifestum est, quoniam si a puncto ^<br />

circuli duee lineae rectae sese contingant, et sibi invicem<br />

sint sequales, super datas rectas lineas circuli<br />

describere partes convenit.<br />

EX QUARTO LIBRO EUCLIDIS MEGARENSIS.<br />

Intra datum circulum data; rectae lineae, quse 'dia-<br />

metro minime major existat, sequara rectam lineam l'.<br />

coaptare oportet.<br />

lutra datum circulum, dato triangulo sequorum<br />

angulorum, triangulum collocare conveuit.<br />

G A H E<br />

Circa datum circulum, fdato triangulo aaqualium<br />

angulorum, triangulum designandum est.<br />

est.<br />

FH B N<br />

Intra datum tnangulum circulum designare necesse<br />

Intra propositum quadratum circulum designare.<br />

Circa datum circulum quinquangulum sequilate-<br />

rum, et ffiquiangulum designare geometrse prseci-<br />

piunt.<br />

Intra datum circulum quinquangulura, quod est<br />

sequilaterum atque aequiangulum, desiguare uon dis-<br />

convenit.

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