The difference of perimeter and diameter of a circle is X unit. The diameter of the circle is
Difference of perimeter and diameter = $$2 \pi r - 2r = X$$
=> $$2r = \frac{X}{\pi - 1}$$
=> $$r = \frac{X}{2(\pi - 1)}$$
=> Diameter = 2*r = $$\frac{X}{\pi - 1}$$units
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