Torus

Torus Facts
Notice these interesting things:
  It can be made by revolving a small circle along a line made by another circle.
  It has no edges or vertices
  It is not a polyhedron
 
Torus Radii
And for reference:
  Surface Area = 4 × π2 × R × r
  Volume = 2 × π2 × R × r2
  Note: Area and volume formulas only work when the torus has a hole!
torus in the sky

Torus Cushion Illustration

And did you know that Torus was the Latin word for a cushion?

(This is not a real roman cushion, just an illustration I made)

Torus in the Sky. The Torus is such a beautiful solid, this one would be fun at the beach !


Note: If you have more than one torus
they are called tori



More Torus Images

As the small radius (r) gets larger and larger, the torus goes from looking like a Tire to a Donut:
Torus TireTorus Donut

 

 
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