Extruding an Arc

[coolguy2818]

I am running autocad 2004. I need to extrude an arc, but after I enter the Extrude command, it asks for thickness then it asks for angle. After I enter in those, it always says cannot extrude. The reason I want to extrude is so I can use the Union command to make one 3d object. Can someone please give me some tips?

[hendie]

you cannot extrude an arc. you can only extrude solids or regions or closed polylines.
you must first add something to the arc to "close" it

[coolguy2818]

Ok, so lets take for example I have a square and I trim one side from it. Then I take and make an Arc to both ends where the side was trimmed from. How then would I "close" it so I could Extrude? Thanks

[tlyall]

convert all lines, segments, etc.. to polylines. In the "draw" pulldown, select "region"... Follow the commands in the command line.

HTH...

[hendie]

type PEDIT, select the arc or the "square", select YES when prompted to change it to a polyline, then type J for Join and select the entities to join.
you should see the following command prompts

Command: pe
PEDIT Select polyline:
Object selected is not a polyline
Do you want to turn it into one? <Y>
Enter an option [Close/Join/Width/Edit vertex/Fit/Spline/Decurve/Ltype
gen/Undo]: J
Select objects: 1 found
Select objects: 1 found, 2 total
Select objects: 1 found, 3 total
Select objects:
2 segments added to polyline
Enter an option [Open/Join/Width/Edit vertex/Fit/Spline/Decurve/Ltype gen/Undo]:
The last line is important ~ it should state Open as in the example above ~ this tells you the polyline is closed ~ if the line states Close then you know the polyline is still open and end points are not coincident
Once you have the closed polyline you can extrude it