Discussion:  All Tools in Geometry on Computer 
Topic:  geom construction software with compass > arcs, not circles 
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Subject:  RE: geom construction software with compass > arcs, not circles 
Author:  jdad 
Date:  Sep 23 2011 
 Create points A, B (used for radius)
 Create point C (this is where your arc will be centered
 create another point D (this will give the direction of your arc from C)
 construct a circle of radius AB centered on C
 construct ray CD
 construct perpendicular of CD through D, points F and G are intersections with
the circle
 construct arc with center C between F and G
Create new tool with inputs A, B, C, and D and output arc CFG!
To use it you click on your new tool icon and then poits A and B to give radius.
Then click C to specify the arc center and D to give it a direction. You can
slide D to make the arc bigger or smaller (from nothing to a semicircle).
Then hide D (if you like) and you're done!
It works with GSP also. I had to create a segment AB to feed distance to the
"construct circle by center and radius." I also finally figured out the
selecting only the necessary inputs and outputs before "create new tool" gets
rid of all the intermediate cruft. I don't remember seeing this in the
documentation I could find.
 
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