# Re: [PEDA] [PROTEL EDA USERS]: Schematic arc problems

```This relates to PCB arcs, however.....

Your answer of starting and ending at 90 degrees had me thinking, as I
normally start at 0 and end at 360 for circles.  I tried starting at 90 and
ending at 90, and Protel intervenes by "defaulting" it to a 0 to 360 degree
setting.  It seems that for any full circle, Protel changes the parameters
to 0 start - 360 end.

Anyway, that's a bit of trivia and off the schematic arc topic.

It's a nice day and it's home time.

Regards
Brendon.

----- Original Message -----
From: "Abd ul-Rahman Lomax" <[EMAIL PROTECTED]>
To: "Multiple recipients of list proteledausers"
<[EMAIL PROTECTED]>
Sent: Tuesday, March 06, 2001 3:26 PM
Subject: Re: [PROTEL EDA USERS]: Schematic arc problems

> At 12:47 PM 3/6/01 +1300, Brendon Slade wrote:
>
> >When rotating from zero degrees to form a circle, what comes after 359
> >degrees?  It has to be 360 degrees, right?  While multiples of 360
degrees
> >end at the start point, being 0 degrees, using a start point of 0 and an
end
> >point of 360 degrees shows the path of a full circle, as opposed to a
start
> >of 0 and an end of 0, which results in an arc of 0 length.
>
> What about starting at 90 degrees and ending at 90 degrees?
>
> Zero is deceptive because it is a bearing with more than one name.
>
> Yes, 0 to 0 is zero length trignonometrically, and 90 to 90 would also be
> zero length. A full circle starting at 90 would be 450 degrees endpoint.
> But we don't want those complications, do we?
>
> [EMAIL PROTECTED]
> Abdulrahman Lomax
> P.O. Box 690
> El Verano, CA 95433
>
>
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