安裝中文字典英文字典辭典工具!
安裝中文字典英文字典辭典工具!
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- Torus - Math is Fun
Note: Area and volume formulas only work when the torus has a hole! Like a Cylinder Volume: the volume is the same as if we "unfolded" a torus into a cylinder (of length 2 π R): As we unfold it, what gets lost from the outer part of the torus is perfectly balanced by what gets gained in the inner part
- Torus -- from Wolfram MathWorld
An (ordinary) torus is a surface having genus one, and therefore possessing a single "hole" (left figure) The single-holed "ring" torus is known in older literature as an "anchor ring " It can be constructed from a rectangle by gluing both pairs of opposite edges together with no twists (right figure; Gardner 1971, pp 15-17; Gray 1997, pp 323-324) The usual torus embedded in three
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