An obelisk is a stone pillar erected as a monument that usually consists of a pyramid atop a tall square (or sometimes rectangular base). Theelongated square pyramid can therefore be considered as a special case of an obelisk.

Harris and Stocker (1997) use the term "obelisk" to mean a polyhedron formed by two noncongruent parallel rectangles whose side faces are trapezoids. Thevolume of such a solid is given by

			(1)
			(2)

The distance from the bottom base to thegeometriccentroid is

(3)

The term obelisk is sometimes also used to refer to thedaggersymbol (Bringhurst 1997, p. 275).

See also

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More things to try:

• arcsin(1/2)
• curl (curl F)
• linear fit {1.3, 2.2},{2.1, 5.8},{3.7, 10.2},{4.2, 11.8}

References

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Cite this as:

Weisstein, Eric W. "Obelisk." FromMathWorld--A Wolfram Resource.https://mathworld.wolfram.com/Obelisk.html

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