From what? You need other variables you can use in the standard circle formulae from which to calculate the radius.
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Double the Radius to Calculate the Diameter.
how to calculate the elbow radius or elbow length
diameter = 2 * radius
there is no constant that will calculate this, since circumference is calculated with only radius and area with radius squared. you will have to calculate the radius using the initial circumference and then the radius again for the new circumference (with the 50 added). then calculate an area for each radius..then you can see the increase.
Circumference = 2*pi*radius