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Euclid: Elementa

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eng
lat Clavius
COLLIGITVR etiam ex hoc problemate, quanam arte describendus sit circulus, qui per duta tria puncta non in vna recta linea existentia transeat. Nam si data puncta tribus rectis iungantur, ut constituatur triangulum, facile ciica ipsum circulus describetur, ut hac propositione traditum est. Quod tamen facilius efficietur praexiilla, quam tradidimus propos.25.lib.3. Sint enim datis tria puncta A, B, C; Ex A, et B, quouis interuallo eodem duo arcus describantur se intersecantes in D, et E, punctis, per quae recta linea ducatur DH. Item ex A, et C, quouis alio interuallo eodem, vel etiam, si placet, priori illo, alij duo arcus delineentur secantes sese in F, et G, punctis, per quae recta ducatur FH, secans rectam DH, in H. Dico H, esse centrum circuli transeuntis per data puncta A, B, et C. Nam si ducerentur rectae AB, AC, BC, diuiderentur latera AB, AC, trianguli ABC, bifariam a rectis DH, FH, ceu demonstratum est in praxi illa propos.25.lib.3. Quare ut in hoc 5. problemate Euclides ostendit, H, erit centrum circuli circa triangulum ABC, descripti. Quod est propositum.
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kin 幾何原本
增。從此推得一法。任設三點。不在一直線。可作一過三點之圜。其法、先以三點作三直線相聯。成三角形。次依前作。
其用法。甲、乙、丙、三點。先以甲、乙、兩點各自為心。相向、各任作圜分。令兩圜分相交於丁、於戊。次甲、丙、兩點。亦如之。令兩圜分相交於己、於庚。末作丁戊、己庚、兩線、各引長之。令相交於辛。卽辛為圜之心。 論見三卷二十五增。
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