Casati, Paolo
,
Terra machinis mota : dissertationes geometricae, mechanicae physicae hydrostaticae
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æqualem interno RGI: inuento igitur RGI,
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innoteſcit angulus, quem cum perpendicu
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lo facit linea viſualis AE. </
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<
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>Cum itaque IE &
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IG æquales ſint & ad angulum rectum, con
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ceptâ rectâ EG angulus EGI eſt gr. 45, cui
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æqualis reliquus GEI additus angulo BEA gr.
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60. fit totus angulus GER gr. 105; latus au
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tem EG ſubtendens angulum rectum, no
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tum eſt, cum nota ſint latera IG, & IE; de
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mum notum eſt latus ER. </
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<
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>Quare ex notis
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lateribus EG & ER vnâ cum angulo com
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prehenſo inuenitur angulus EGR, qui dem
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ptus ex EGI gr. 45. relinquit notum RGI
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æqualem angulo SIB; & ſic innoteſcit angu
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lus SIE æqualis angulo, quem facit linea vi
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ſualis EA
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">cum</
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lineâ AT iungente oculum ob
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ſeruatoris cum centro terræ. </
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<
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>Cum igitur ſatis
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amplum huiuſmodi triangulum facilè poſsi
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mus conſtruere, etiam additâ regulâ IG, &
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alibi diuiſam vnciam habere poſsimus iņ
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partes ſaltem centeſimas eâ methodo, quam
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indicat Adrianus Metius in ſuâ Geometriâ,
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patet fieri poſſe, vt quàm euidentiſsimè in
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noteſcat angulus ille, quem obſeruatum ſup
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ponebam ad inueſtigandam terræ magnitu
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dinem. </
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<
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redeamus. </
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Gal.
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<
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