It does the same thing that the height of a person does . . . it provides
a way to describe the circle to other people without drawing a picture.
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The cord of a circle that contains the center of that circle is a diameter of that circle.
You do a diameter circle!!
A circle with a diameter of 28 is a circle.
The radius of a circle is half the diameter so if the radius of a circle is r, then the diameter is 2r.
The diameter of a circle is twice its radius