The elements of Euclid : viz, the first six books, together with the eleventh and twelfth : the errors, by which Theon, or others, have long ago vitiated these books, are corrected, and some of Euclid's demonstrations are restored : also, The book of Euclid's data, in like manner corrected (1834)
Euclid, Euclid, Simson, Robert, 1687-1768 · Philadelphia : Desilver & Thomas · leaf 221
218 THE ELEMENTS OF EUCLID. BOOK Xlly^ … length remain some segments of the cone, which together shallbe less than the excess of the cone above the third part of the cy-linder. Let these be the segments upon AE, EB, BF, FC, CG^GD, DH, HA. Therefore the rest of the cone, that is, the pyra-mid, of which the base is the polygon HAEBFCGDH,…
Mathematics, Greek · Geometry · Trigonometry
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