Typical answer from The WikiAnswers Community: IT IS WRONG!
The diameter is the distance across the circle, through its centre. It is double the radius, not the other way round!
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The circumference of a circle with a diameter of 7.2 is 22.62. (rounded)
circumference = diameter * pi. Therefore, diameter = circumference ÷ pi.
The circumference of a circle with a diameter of 1 cm would be 0.31. This is used a lot in math.
The cord of a circle that contains the center of that circle is a diameter of that circle.
You do a diameter circle!!