Definition of Terms, ContinuedSolids(Continued)Pyramids have polygons for a base and triangular lateral faces that intersectat the vertex or top of the pyramid.A centerline from the vertex to thecenter of the base is known as the axis and its height is called the altitude.Ifthe axis is perpendicular to the base, the pyramid is a right pyramid. Allother pyramids are oblique pyramids. A pyramid that has been cut off nearthe vertex oblique to the base is said to be truncated; if the pyramid is cut offparallel to the base, the cut plane is known as a frustum.Figure 2-13 illustrates pyramid terminology.Figure 2-13.—Pyramids.Continued on next page2-15
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