Commandino, Federico - Liber de centro gravitatis solidorum

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1compoſitam proportionem habet ex proportione baſium,
& proportione altitudinum. Quare & pyramis, cuius ba
ſis eſt quadrilaterum abcd, & altitudo ef ad pyramidem,

56[Figure 56]
cuius baſis quadrilaterum ghKl, & altitudo mn, compoſi
tam habet proportionem ex proportione baſium abcd,
ghkl, & ex proportione altitudinum ef, mn. quod qui
dem demonſtraſſe oportebat.

20. huius

Ex iam demonſtratis perſpicuum eſt, priſma
ta omnia, & pyramides, in quibus axes cum baſi
bus æquales angulos continent, proportionem
habere compoſitam ex baſium proportione, &
proportione axium. demonſtratum eſt enim, a
xes inter ſe eandem proportionem habere, quam
ipſæ altitudines.

THEOREMA XVIII. PROPOSITIO XXII.

CVIVSLIBEt pyramidis, & cuiuslibet coni,

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