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bicone : ウィキペディア英語版
bicone

A bicone or dicone (Bi- comes from Latin, Di- from Greek.) is the three-dimensional surface of revolution of a rhombus around one of its axes of symmetry. Such a bicone has circular symmetry and orthogonal bilateral symmetry.
Alternatively, one can view a bicone as the surface created by joining two congruent right circular cones base-to-base.
== Geometry ==
For a circular bicone with radius ''R'' and height center-to-top ''H'', the formula for volume becomes
:V = \frac \pi R^2 H.
For a right circular cone, the surface area is
:SA =2\pi R S\,   where   S = \sqrt   is the slant height.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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