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   CarlB, i'm coming back on my answer. it's true that my sentence was not right.
Instead of "what about the chord" I wrote "where is the chord" and this leaded to this confusion.
I apologize for this.

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philippe JOSEPH Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 14.Mar.2011 Location: France Using: AutoCAD Mechanical 2017 Status: Offline Points: 1493	Posted: 03.Apr.2013 at 08:04
	CarlB, i'm coming back on my answer. it's true that my sentence was not right. Instead of "what about the chord" I wrote "where is the chord" and this leaded to this confusion. I apologize for this.

CarlB Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 16.Oct.2009 Location: United States Status: Offline Points: 321	Posted: 03.Apr.2013 at 20:59
	Bonjour Phillipe, You have drawn the arc and chord correctly, for a chord that bears to the northeast. jybaylie provided incomplete information on the chord bearing, we don't really know if bearing was to northwest or northeast since chord bearing didn't have a "W" or "E" at the end of the bearing. Whether a curve is to the "right" or "left" is relative to the line bearing prior to the curve, that also wasn't provided. As to your units question, change the "angle type" (ddunits - Unites de dessin) to Surveyor (arpenteur?), then listing of lines will show bearings/angles with cardinal directions. Carl should have read

philippe JOSEPH Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 14.Mar.2011 Location: France Using: AutoCAD Mechanical 2017 Status: Offline Points: 1493	Posted: 04.Apr.2013 at 07:23
	CarlB, thanks again for all, I changed the angles units to : UnitĂ©s gĂ©odĂ©siques and I had the information on the angle inside the informations of the LIST : Angle dans le plan XY = S 35d29'19.0000". I had to choose between : Deg/Min/Sec , DegrĂ©s dĂ©cimaux , Grades , Radians , UnitĂ©s gĂ©odĂ©siques. It looks that I have the good information. Maybe some dayjbaylie will give us the information about the correctness of all this. I'm interrested in this because of the basic design, the topografic informations, the units that are different from what I see every day although beeing in an erection company that builts penstocks we regularly face civil engineering working with absolute coordinates in site works nd we have to provide them correct absolute coordinates. CrlB, thanks again for the time waisted for me ( us ).

heinsite Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 05.Feb.2009 Location: United States Using: AutoCAD 2014 Status: Offline Points: 640	Posted: 04.Apr.2013 at 08:45
	We know it's a curve to the right. What we don't know (yet, the OP might still be able to provide it) is the bearing of line into the PC. We know the Radius and the Central Angle (Delta). That's all we need. The bearing of the Chord is (in this case) equal to the bearing of the line to the PC - Delta/2. Now it's simply a matter of drawing the lead line, a perpendicular line with the Radius to the centerpoint, and a circle. The PT (point of tangency) will be the intersection of the circle and the chord line. Dave.
	Dave Hein, P.E. Hawaii District Engineer Kona International Airport AutoCAD Certified Professional Autodesk Expert Elite

heinsite Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 05.Feb.2009 Location: United States Using: AutoCAD 2014 Status: Offline Points: 640	Posted: 04.Apr.2013 at 09:30
	I looked at this again... you can compute the bearing of the line into the PC using the bearing of the Chord (given). Learning the relationships of a horizontal curve are important. With a little simple trigonometry everything can be worked out as long as you know two items. Here, the key items are the Radius and Delta (central angle). From there it's a simple matter. But having a good calculator handy helps! I had to do most of this with paper and pencil here tonite! Dave. uploads/35918/curve.dwg Edited by heinsite - 04.Apr.2013 at 09:44
	Dave Hein, P.E. Hawaii District Engineer Kona International Airport AutoCAD Certified Professional Autodesk Expert Elite

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