topic Re: How to find P.I. in an existing polyline (AutoCAD 2018) in AutoCAD Forum https://forums.autodesk.com/t5/autocad-forum/how-to-find-p-i-in-an-existing-polyline-autocad-2018/m-p/8965902#M131030 <P>Do you mean you want to find the point of intersection of a pline where there are two tangents between an arc within the pline?</P><P>&nbsp;</P><P>If so, just start the CIRCLE command, and when prompted to "Specify center point for circle" use the "Apparent Intersection" object snap (i.e. Shift+Right Click your mouse button and select "Apparent Intersection"), click on one of the pline tangents, and then hover your cursor over the second tangent, and then an "X" will appear where the PI is, and then just click your mouse button to draw the circle.</P> Wed, 14 Aug 2019 14:19:04 GMT murray-clack 2019-08-14T14:19:04Z How to find P.I. in an existing polyline (AutoCAD 2018) https://forums.autodesk.com/t5/autocad-forum/how-to-find-p-i-in-an-existing-polyline-autocad-2018/m-p/8965737#M131029 <P>I do not have access to my Civil 3D for a week and I am trying to see if it is possible to find a P.I. in a drawing from an existing polyline? Thank you in advance.</P> Wed, 14 Aug 2019 13:20:58 GMT https://forums.autodesk.com/t5/autocad-forum/how-to-find-p-i-in-an-existing-polyline-autocad-2018/m-p/8965737#M131029 Anonymous 2019-08-14T13:20:58Z Re: How to find P.I. in an existing polyline (AutoCAD 2018) https://forums.autodesk.com/t5/autocad-forum/how-to-find-p-i-in-an-existing-polyline-autocad-2018/m-p/8965902#M131030 <P>Do you mean you want to find the point of intersection of a pline where there are two tangents between an arc within the pline?</P><P>&nbsp;</P><P>If so, just start the CIRCLE command, and when prompted to "Specify center point for circle" use the "Apparent Intersection" object snap (i.e. Shift+Right Click your mouse button and select "Apparent Intersection"), click on one of the pline tangents, and then hover your cursor over the second tangent, and then an "X" will appear where the PI is, and then just click your mouse button to draw the circle.</P> Wed, 14 Aug 2019 14:19:04 GMT https://forums.autodesk.com/t5/autocad-forum/how-to-find-p-i-in-an-existing-polyline-autocad-2018/m-p/8965902#M131030 murray-clack 2019-08-14T14:19:04Z