Piping Isometric odd angle shaded offset

[Dave a M]

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Trying to work out if I am doing it correctly using the correct angle for arc length roll and also fiiting angle

hoping someone can help with above isometric examples ?

Thanks so much
Dave

 

[Dave a M]

Sent again with isometric drawings attached correctly,
looking to find out if reading correctly for correct angle roll of pipe and angle req for arc length for fabrication.
Hope somebody can correct me and give detail if I am wrong

Thank you
Dave a M