What is a diameter In Math?

Answer 1

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.

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The second part is correct, the first is not.