c=diameter
a=lenght
b=width
c=sqrt(a^2 + b^2) ---- or in words, the diameter equals the square root of length squared plus width squares, that's the Pythagorean Theorem.
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Subtract the square of the width from the diameter. The square root of that is the length.
Do you mean perimeter? If so....2 x length + 2 x width.
If by that you mean knowing only the diagonal and the width, then by the formula a2+b2=c2, where a is the length, b the width and c the diagonal. To find the width b, you need to calculate sqrt(c2-a2). For example, the width of a rectangle with length 3 and diameter 5 is sqrt(52-32)=4
The "diameter" is the maximum width of a circle. It is not a fixed unit of length.
If you mean the diameter and radius of a circle given the circumference it is:- diameter = circumference/pi radius = circumference/(2*pi)