Measure to the center of the Ell and decuct for the threads ..
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this app help you: "Miter Flat Pattern Design" in play.google.com
39in.
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"
1-13/16"= The tangent of half the degree X the radius of the elbow.
1/2 inch