# Arc Length... How do you do it?

## Recommended Posts

Mmmmk. I have to put anomalies into a pipe at certain degrees and locations. I am given the OD, and the OD arc length distance from 0° to the anomaly. So what I do is trig and calculate the degree via "arc length=2πR*(C/360)". Get my angle, draw my line from center.

Is there any easier way of just placing an arc start point, the radius and how long you want it!?!?!?!

##### Share on other sites

You can draw an arc of the radius needed, any length. Then use Lengthen command to set to actual length needed.

##### Share on other sites

Do not remember in AutoCad but in DraftSight you can use DRAW -- ARC -- START END RADIUS which i think rkent is telling you.

##### Share on other sites

if you are happy doing a bit of calculation, you could streamline getting the angle.

Divide the arc length by the diameter. This gives the angle in radians which you can enter when drawing your arc. Probably 4 decimal places is enough and put an "r" immediately after the numbers. AutoCAD will understand that the angle is in radians without having to change the angle units.

## Create an account

Register a new account