Command: _circle 3P/2P/TTR/<Center point>: Diameter/<Radius> <50>:

Command: *Cancel*

Command:
Command:
Command: _line From point: _cen of
To point: _qua of
To point:

Command: *Cancel*

Command:
Command:
Command: _rotate
Select objects: 1 found

Select objects:

Base point: _cen of
<Rotation angle>/Reference: 135

Command:
Command:
Command: _ucs
Origin/ZAxis/3point/OBject/View/X/Y/Z/Prev/Restore/Save/Del/?/<World>: _ob
Select object to align UCS:
Command:
Command:
Command: _line From point: _endp of
To point: @0,100

To point:

Command: *Cancel*