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In geometry, a bipyramid, dipyramid, or double pyramid is a polyhedron formed by fusing two pyramids together base-to-base.The polygonal base of each pyramid must therefore be the same, and unless otherwise specified the base vertices are usually coplanar and a bipyramid is usually symmetric, meaning the two pyramids are mirror images across their common base plane.
The base regularity of a pyramid's base may be classified based on the type of polygon: one example is the star pyramid in which its base is the regular star polygon. [28] The truncated pyramid is a pyramid cut off by a plane; if the truncation plane is parallel to the base of a pyramid, it is called a frustum.
A 3-orthoscheme is not a disphenoid, because its opposite edges are not of equal length. It is not possible to construct a disphenoid with right triangle or obtuse triangle faces. An orthoscheme is an irregular simplex that is the convex hull of a tree in which all edges are mutually perpendicular. In a 3-dimensional orthoscheme, the tree ...
The pyramid's natural limestone core is clearly visible as the yellow stratum at its base. The Pyramid of Senusret II at El Lahun is the southernmost royal-tomb pyramid structure in Egypt. Its builders reduced the amount of work necessary to construct it by using as its foundation and core a 12-meter-high natural limestone hill.
The core of the pyramid was constructed in six steps composed of small irregular pieces of limestone blocks bound together using clay mortar. [2] The length of the base step of the pyramid was 78.75 m (258 ft; 150 cu), [3] with each step built around 7 metres (23 ft; 13 cu) high, [2] converging to the peak at a slope of 52° giving the pyramid ...
The preserved elements suggest that it had a base length of 11.5 m (38 ft; 22 cu), a fifth of that of the main pyramid. The pyramid's covering slabs were inclined at 69°. This was typical for cult pyramids which had a 2:1 ratio-ed slope, and thus a height equal to the length of the base, i.e. 11.5 m (38 ft; 22 cu).
A satellite pyramid, suggested by some Egyptologists to have been built to house the pharaoh's ka, is located 55 metres (180 ft) south of the Bent Pyramid. [21] The satellite pyramid originally measured 26 metres (85 ft) in height and 52.80 metres (173.2 ft) in length, with faces inclining 44°30'.
The alignment of the pyramid complex on a South to North axis was also a common during the 3rd Dynasty. [2] [8] Additionally, W. Helck and Eberhard Otto point out, that the design similarities between the pyramid of Baka and that of Djedefre might be striking, but the design of Djedefre's pyramid was atypical for the 4th Dynasty anyway. Thus ...