fold the flat sheet at radius of 50 mm making arc (equal to circumference) and sketched line will be the quadrant without making forming tool
What exactly you want. Clarify your requirement.
Why can't you create the folded sheet at first step itself? In case you need to do some operations on the sheet, you can unfold it (using unfold command in sheet metal) and then fold it back (using fold command in sheet metal).
Else use flex command to fold/bend it at required shape.
Are you aware of the Sketch Bend tool?
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