How to draw an arc at a certain radius and length?

[russel]

how do you draw an arc at a certain length and radius?

for example I want to draw an arc at 149'-9" long at an 2793.25' radius.

[Kent1Cooper · Accepted solution]

I don't think you can do that directly with standard AutoCAD Arc-command options.  I think you'll need to use a routine such as [just one example] ArcLength.lsp, available here.

Or, in two steps, you can draw an Arc at the desired radius, of any length [or a Circle, and Break part of it out to make an Arc], and use LENGTHEN and its Total option to make it the length you want.

[TheCADnoob · Accepted solution]

@Kent1Cooper solution of lengthening you arc sounds best, but i created this video so i figured id share it any way. 

The formula i used is 

c=(360∙L)/(2∙π∙r)

[russel]

that helps thanks.  a little more work than I wanted to do but still works.

would be great if they had a feature where you could type in the radius you wanted along with the length you wanted and hit enter.

[TheCADnoob]

@Kent1Cooper's suggestion is much easier

[russel]

that way is even easier, thanks for the help.

[davidUB2V2]

Thank you for the help with this topic. 

[Anonymous]

great answer (even if not yours)!
thanks for the instructional video

[Charles_Shade]

Nice

[Des_R-Turner]

Thank you. LENGTHEN and Total worked great for what I needed.