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how to change the arc from concave to convex?


MemberX

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Draw the arc in the other direction; use what you had as endpoint previously as Startpoint now.

 

This is one of the quirks of AutoCAD, arcs only go one way (mostly) :wink:

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Sometimes there isn't anything to snap to at that end of the arc, so you can still pick the original point, then specify a negative angle

 

Command: _arc 
Specify start point of arc or [[color=red]Center[/color]]: [b]C[/b] 
Specify center point of arc:
Specify start point of arc:
Specify end point of arc or [[color=red]Angle[/color]/chord Length]: [b]A[/b]
Specify included angle: [b]-90[/b]

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