The elements of Euclid for the use of schools and colleges; comprising the first six books and portions of the eleventh and twelfth books; (1903)
Euclid, Todhunter, I. (Isaac), 1820-1884, ed. edt, Simson, Robert, 1687-1768, ed. edt · London; New York, Macmillan · leaf 297
Octahedron. Dodecahedron. Icosahedron. 30. A parallelepiped is a solid figure contained by sixquadrilateral figures, of Avhichevery opposite two are parallel. … 286 EUCLIDS ELEMENTS. 31. The projection of a lineon a plane is the line joiningthe feet of the perpendicularslet fall from the points in thatline upon the plane. Thus ahcis the projection of ABC uponthe plane MN.
Euclid's Elements · Geometry · Mathematics, Greek
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