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| a pyramid whose apex is on a line which is perpendicular to the center of the base. Further, the lateral faces are all at the same angle with the base |
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| a pyramid whose apex is not on a line which is perpendicular to the center of the base. Further, the lateral faces are not all at the same angle with the base |
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| the perpendicular distance between the apex of a pyramid and the plane of the base of that pyramid |
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| the perpendicular distance from the apex of a pyramid, on a lateral face, to an edge of the base of that pyramid. In effect, because each of the lateral faces of a pyramid is itself a triangle, each lateral face has its own slant height with is the altitude of that triangle. It is usually represented by a script letter "l" |
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