39in.
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1/2 inch
1-13/16"= The tangent of half the degree X the radius of the elbow.
Measure to the center of the Ell and decuct for the threads ..
Short Radius 90 degree elbows are the same as pipe size.... Long Radius 90's are pipe size times 1.5.... so a 6" (SR) elbow is 6"... a 6" (LR) elbow would be 9"
this app help you: "Miter Flat Pattern Design" in play.google.com