In math, a diameter is a(n imaginary) line that connects any "side" of the circle to the other side. (I don't circles don't have sides, but you get the idea.) Here's an example:
(Pretend the lowercase o's make up the circle, and the line makes up the diameter!) oooo
o | o
o | o
o | o
o o As you can see, that line in the "un-perfect" circle is the diameter! Answered by: QWERTY
The radius squared. (r2)
OR
The distance from one end of the circle to another, crossing through the center of the circle.
* * * * *
The second part is correct, the first is not.
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the width of a circle
i think that you do math?
It is in a diameter of a circle, which is bassicly means the length of a circle, right through the middle.
The circumference of a circle with a diameter of 1 cm would be 0.31. This is used a lot in math.