Commandino, Federico
,
Liber de centro gravitatis solidorum
,
1565
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compoſitam proportionem habet ex proportione
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& proportione altitudinum. </
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">Quare & pyramis, cuius ba
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ſis eſt quadrilaterum abcd, & altitudo ef ad pyramidem,
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cuius baſis quadrilaterum ghKl, & altitudo mn, compoſi
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tam habet proportionem ex proportione baſium abcd,
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ghkl, & ex proportione altitudinum ef, mn. </
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dem demonſtraſſe oportebat.</
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20. huius</
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">Ex iam demonſtratis perſpicuum eſt, priſma
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ta omnia, & pyramides, in quibus axes cum baſi
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bus æquales angulos continent, proportionem
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habere compoſitam ex baſium proportione, &
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proportione axium. </
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xes inter ſe eandem proportionem habere, quam
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ipſæ altitudines.</
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