8.—A pyramid is a solid whose sides are alltriangles meeting in a point at the vertex, andthe base any plane figure whatever. … Oss. 1.—It is called a triangular pr/ramid when its base is:i triangle; z square pyramid.-when its base is a square; apentagonal pyramid, when its base is a pentagon; and30 on. Obs. 2.—A prism, or a pyramid, is regular, or irregular,according as its base is a regular or irregular plane fig^e. CHo…
Design · Decoration and ornament · Art
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