quarter circle arc with specific length

[Anonymous]

Hello, can someone help me create an arc with these properties:

I know that the total length of the arc needs to be 12 mm and it needs to be QUARTER CIRCLE arc, so, I don't know what the exact radius is.

Thanks!

[Alfred.NESWADBA · Accepted solution]

Hi,

perimeter of a circle = diameter * PI

as you want to have a quarter of a circle then

length = diameter * PI / 4

as the length should be 12mm

12 = diameter * PI / 4

12 * 4 / PI = diameter

diameter = 48 / PI = 15.27887

- alfred -

[Anonymous]

Thanks Alfred, but I was asking if there is a way to do this using the app's tools.

[Alfred.NESWADBA]

Hi,

>> but I was asking if there is a way to do this using the app's tools

Did not understand the question in that way.

But yes, you can do it with the build in calculator (which is a tool inside AutoCAD too, isn't it?)

Other methods are much more complex (using parametric could be critical as there does not exist a direct method to access the arc-length), using LISP or the API could be an option too.

- alfred -

[Anonymous · Accepted solution]

I think I found a way to solve it.
I drew a circle with a random radius. I've selected it, opened the object properties window (Ctrl+1) and in the circumference field I typed 48. The circle radius will adjust to the new value and then I can trim it.

[Alfred.NESWADBA]

. alfred -