Is the diameter of a circle always the same?

Answer 1

Every diameter of the same circle is the same length, and unless someone comes along

and stretches the circle when you're not looking, the diameter doesn't change.

So...YES

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I disagree...

No they are not... all circles would be the same size if that were the case.

What remains a constant is that all circles are 360 degrees.

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The question doesn't ask about " ... the diameter of circles ... ".

It asks about " ... the diameter of a circle ... ".

The diameter of circles is not always the same, but

the diameter of any one circle is always the same.

P.S.: This is not the place to debate the answer.

The "discussion area" is.