How to calculate a 90 degree elbow center?

If your elbow is a short radius it is 1 times your nominal pipe diameter. If it is a long radius it is 1 1/2 times your nominal pipe diameter.show me the exact pattern of long radius.

(90/2tan*Dia*1.5*25.4)
(45/2tan*Dia*1.5*25.4)
u will obtain Ur answer in (mm)

For 90 degree elbow(Dia*38.1) this formula used for only 90 degree elbow.
For 45 degree elbow(45/2of tan*Dia*1.5*25.4) this answer obtained in (mm).

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