Two times the radius, or, 2r.
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A diameter is a chord, because a chord always goes from one point to another in a circle, and a diameter does too.
Frisbees come in different sizes. The diameter can be 8 inches, 10 inches, 12 inches, or another diameter.
The straight-line measurement from one point to another through the origin of a circle is the diameter of the circle.
it is a diameter.
The diameter of a circle is twice its radius or its largest chord passing through the center of the circle.