Phillips, Andrew Wheeler, 1844- [from old catalog] · [New York, Press of J. J. Little & co.] · leaf 6
whose base is in the horizontal plane, but the sides of the base areneither parallel nor perpendicularto the vertical plane. The quadrilateral in Fig. 2 rep-resents the actual size and positionof the base. O/ is a line drawnin the plane of this base parallel tothe vertical plane, and the… … FiG. 2. UNIVERSITY EXTENSION. scribed. A is the position of the foot of a perpendicular drawnfrom the vertex of the pyramid to the base. £ M H i ■7 / / / «- 5 Fig. d f 3- Fig. 3 is the pro-jection of the pyramid.O/is a horizontal linewith points a b c d fmarked upon it in thesame scale as the…
Geometry
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