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In article ,
s wrote:

Yea but when you heat the wire, it gets thicker. That means one side
would move toward the center of the circle.

Dick

the hole isn't part of the metal. it's where the metal isn't. look at
it like this: say you have a piece of wire. you heat it, it expands
and gets longer. now say you bend it into a circle. you heat it, it
gets longer. the corcle gets bigger, both inside and outside diameters