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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"
Radius = Diameter/2 so the radius of a "a" is 4 inches.
Radius = 8/2 = 4 inches
4 inches. The radius = 1/2 of the diameter
12 inches because the radius is always half of the diameter