For a circle, the length and width are the same: from one side of the circle to the opposite point is the same value. The diameter is the longest possible length of any line connecting two points on the circle.
This differs from a square or rectangle, where the length or width is not the longest line, but rather the diagonal from opposite corners.
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The "diameter" is the maximum width of a circle. It is not a fixed unit of length.
Any number you like. You can have a tiny circle with a tiny diameter or a huge big circle with a big diameter. The diameter is simply the "width" of the circle. It is the length of the line from one side to the other which passes through the centre.
If you mean the diameter and radius of a circle given the circumference it is:- diameter = circumference/pi radius = circumference/(2*pi)
Subtract the square of the width from the diameter. The square root of that is the length.
the width of a circle