Need a fillet between circle and an arc

I need to create a fillet between circle and an arc. Till now I was trying to use .sendcommand method but didnt get much success. Although i know handle of the objects if somebody can help me using send command and handle objects information for filleting i will appreciate that. One of my object is circle other one is arc. i used this approach still it is not doing exactly i wanted it to do
(1) - acdocument.SendCommand "_fillet (handent " & Chr(34)
& "20CF8" & Chr(34) & ") (handent " & Chr(34) & "20FA6" & Chr(34) & ")"

(2) Another approach I think i can draw a circle using ttr tangent. But My only concern is how can I make sure that this circle should be just on one side which I required and should not be on another side. Does anybody think that I would be a viable thing to do. Is there any method for adding circle using tangent tangent and radius circle method. Please feel free to post your ideas

 

Seems like your using a Visual approach to solve a
programming problem? i.e. Visually we would draw
a circle and an arc then fillet them creating a solution
between the two..Code wise you should be looking to
just creating the solution and not the construction lines
we visually use..

or maybe not.......)?

to use .sendcommand method but didnt get much success. Although i know
handle of the objects if somebody can help me using send command and handle
objects information for filleting i will appreciate that. One of my object
is circle other one is arc. i used this approach still it is not doing
exactly i wanted it to do

only concern is how can I make sure that this circle should be just on one
side which I required and should not be on another side. Does anybody think
that I would be a viable thing to do. Is there any method for adding circle
using tangent tangent and radius circle method. Please feel free to post
your ideas

 

If you need to use the fillet command, it requires input similar to what the
lisp command (entsel) returns. Which is a 2 element list, the first being
the ename, the second being the pick point......

 

Can you please send me the syntax, that I can use. Because one I know is not working. I will appreciate your reply

 

what are you trying to do? besides fillet a line and circle? i.e. what
is the arc you are trying to create?

not working. I will appreciate your reply

 

acdocument.SendCommand "_fillet (handent " & Chr(34)

This was the syntax I was using. Here I was just giving the entities through command.

I am also willing to draw a circle using ttr approach. Can you tell me if that is also a viable approach