Hi guys,According to the provided  information. How can I draw the shape ?Thank you.Edwin

Hello wtojp2013, I supose that this is exactly a "parametric constrains" test for you.
I don't know all about this but having tried it, it looks like you have to deal with a formula inside it.
 
I have done a file with constraints, can we see yours before ?
 
 philippe JOSEPH2014-04-02 10:50:51

This certainly doesn't do the whole thing for you, but it might give you something to start from:
http://forums.autodesk.com/t5/Visual-LISP-AutoLISP-and-General/Polygon-from-distance-between-point/m-p/4436825#M315139

Hello Kent and wtojp2013.
I have uploaded my test : SHAPE_01_A.dwg ( no chance with upload here ).
I'm not sure of it 100% because I don't know much about parametric constrain but I'm afraid that it did work
with nearly 2 clics with AUTOCONSTRAIN.
Maybe some parametric constrain specialst ( if exists ) could take a look and criticize it.
 philippe JOSEPH2014-04-02 15:49:19

 
Hope it's helpful for you.
 
Thanks,

Hello dylhunter, your solution looks so simple that you could even go from step 2 to step 6 directly.philippe JOSEPH2014-04-02 20:57:01

Yes. I just want to show the track of the end point. Actually, we can copy the dia. 22 circle to the end point of red line at step 3. then copy one red line to the intersection point. Done.

Sorry. Should be the rad. 20 circle. Not dia. 22 circle.

dylhunter,Thank you very much. This technique is very useful for me.

dylhunter and wtojp2013, I'd say that wtojp2013 and my method work the same in 2 steps.
wtojp2013 is purely geometry and works 100% without any problem.
It should be prefered to mine but if not applicable to a purely geometrical solution you could test it ( see the file : SHAPE_01_A.dwg in the AutCAD blocks library and tell me about it ).