| 翻訳と辞書 | 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
 :
 For a right circular cone, the surface area is
 :   where      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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