Clavius, Christoph
,
Geometria practica
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GEOMETR. PRACT.
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tertia proportionalis B D, acper D, ipſi B C, parallela agatur D E. </
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gulumenim B E, rectilineo dato A, æquale erit; </
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quale ſit; </
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<
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les ſunt.</
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eodem hoc artificio vti poterimus, quando parallelæ BI, CK, non
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faciunt angulosrectos ad B, & </
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drato FH, id eſt, rectilineo A, vt dictum eſt: </
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rectas B I, C K, in I, K, erit parallelogrammum BK, rectangulo CD,
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hoceſt, rectilineo A.</
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verò duæ rectæ BD, CE, non ſint parallelæ, conueniant ad partes D,
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E, in F, (quod tumfiet, cum duo anguli DBC, ECB, minores ſunt duobus re-
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ctis) ſitque primum propoſitum ſuper B C, verſus F, conſtituere trapezium
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rectilineo A, æquale, habenslatus rectæ B C
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, oppoſitum eidem B C, paralle-
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lum. </
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vt patet.</
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<
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ergo A, conſtruatur perea, quæ in ſcholio propoſ. </
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2. </
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mus, æquale quadratum G, cuius latus H I. </
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tertia proportionalis L N. </
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ter L M, & </
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B C, parallela agatur D E. </
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