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For US nickels, 21.2 mmBut I think you mean "how wide" or "what's the diameter". Circles don't have length, remember.
Million. ('thousand thousand')
Wide range basically means allot.
The wheels on the bus go round and round... Along with the wheels on the car, bike, lorry, etc - all circles.
If you mean square units within a circle then it is:- Area = pi*radius squared