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Topic: geom construction software with compass -> arcs, not circles


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Subject:   RE: geom construction software with compass -> arcs, not circles
Author: PeterA
Date: Sep 23 2011
You can create an arc like you want in Sketchpad. I'm assuming that it would
solve your problem if you could draw an arc with center P, passing through Q,
and extending t = 10 degrees to either side of Q. To do this, use the Transform
menu.
(1) Select P and do Transform > Mark Center
(2) Select Q and do Transform > Rotate 10 degrees about center P (creating
R)
(3) Select Q and do Transform > Rotate -10 degrees about center P (creating
S)
(4) Select R, Q, and S and then Construct > Arc Through 3 Points

You can make a tool that will do this. Of course, you can replace 10 degrees by
whatever you want, possibly even introducing a user-settable parameter. Please
let us know if this works for you.
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