Making an arc using polyline command

[Anonymous]

I've given two screenshot from autocad. 

Step1. select polyline command

Step2. go to arc option 

Step3. make an arc

Now,my main questions : 1. On what basis angle subtended by an arc or 

                                                  it's radius is decided ??

                                              2. In this arc formation how can a chord

                                                   length and it's angle with X-axis decides radius of arc or angle subtended by it  ??                                           

[imadHabash]

Hi and Welcome to AutoCAD Forum,

Arc option while PLINE is active begins creating arc segments tangent to the previous segment. there is another options ( Angle/CEnter/Direction ) for more precision . I suggest to check this AKN article that may help . >> Click << 

[Kent1Cooper]

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@imadHabash wrote:

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Arc option while PLINE is active begins creating arc segments tangent to the previous segment. there is another options ( Angle/CEnter/Direction ) ....

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To be more precise, it uses the direction of the end of the last directional object drawn, including the last segment in the current Polyline if there was one.  If you go into Arc mode immediately, after only giving it the initial start point, so there's no direction established in the Polyline yet, its default tangential direction is the direction that the last drawn object "aimed" at the end.  In your image, the last directional object may have been a Line drawn vertically upward, so the Polyline arc starting direction is 90°.

The angle is stored [in radians] in the LASTANGLE System Variable.  If there has not been any directional object drawn yet, that angle is 0.

[And don't forget the Radius option in Arc mode, and the Second-point option, in which you can define a Polyline arc segment with three points just as you can an Arc, but you've already given it the first one.]

[Anonymous]

Sorry,I am unable to understand your words clearly because it's new and strange for me. It will be more better for me if you can answer my two questions. It will be easy for me to enquiry further step by step....

[j.palmeL29YX · Accepted solution]

The user must "feed" AutoCAD with the whished inforations chord length, chord direction and arc radius while drawing the arc(segment). 

Assuming an arc with chord 100 in direction  45° and  arc radius of 80, follow >>this example<<.

[Anonymous]

Thankyou very much for your satisfactory solution!! I don't know how can I contact you for any further queries.....

[j.palmeL29YX]

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@Anonymous wrote:

I don't know how can I contact you for any further queries.....

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I read nearly each day here in the forum ... Post here your question/problem, and hopefullyI will not miss your posting. 😉  

Additional you can send me a PM (Personal Message). But this contradicts the sense of this forum (Users help users).  Others should also be able to benefit from the solutions.