珠子等双锥体
... 全等形 congruent figures 珠子等双锥体 bicone 双生斑 twin spot ...
双锥体
A bicone or dicone (Bi- comes from Latin, Di- from Greek.) is the three-dimensional geometric shape swept by revolving a rhombus around one of its axes of symmetry. Alternatively, one can view a bicone as the surface created by joining two identical right circular cones base-to-base.
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