Obs. 1.—A line (a b in the above figure) drawn from theTertex to the centre of the base, or through the centres ofthe two ends, is called the axis of a solid. I Obs. 2.—When the axis is perpendicular to the base it is^a right prism, pyramid, or cone; otherwise it is oblique. I Obs. 3.—The segment… … Obs. 4.—A frustum or trunk is the part a b c d e f,that remains at the bottom after the segment is cut off.Figure above. Obs. 5.—An ungida, or hoof, is a part of a cylinder orcone, cut off by a plane, passing obliquely through the planeof the base, and one of the sides of the solid, as a b c d a.
Design · Decoration and ornament · Art
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