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Section Modules for Circular tube

Section Modules will be used to compute the radii of a small plastic telescopic ball clamp I am designing. I am really stuck on this problem and appreciate you looking into it.

Section Modules is the resistance to bending of a beam. Section Modules, S for Circular tube is given by:

Attachment 28212 were r1 is inside radius and r2 is outside radius.

Section modulus - Wikipedia, the free encyclopedia

Here is the part I am stuck on:

Given S and r1, solve for r2.