Tip - Draw a circle tangent to 3 equal sized circles

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Tip - Draw a circle tangent to 3 equal sized circles

Postby Clive » Sun Sep 02, 2012 4:47 pm

To draw a circle tangent to 3 equal sized circles (this ones for you Husky :lol: )

1. Draw 3 circles (same radius) with centers at any given coordinate points.
2. Set up ' layer ' construction and draw polyline (A) to connect all the centers.
3. Draw a line (B) > using Relative Angle ( LR) set to 90 and at an arbitrary length (say e.g. 100) and 'snap' to the center/middle of one line to produce a line perpendicular to it (90 degree right angle).
4. Repeat for the other line (C), the intersection of these two lines provides the center point (D) for the 4th circle.
5. From any circle draw a line (E) from its center to the intersection, this will be the radius for the 4th circle.
Job done. :wink:
Attachments
Circle tangent to 3 equal sized circles..png
Circle tangent to 3 equal sized circles..png (15.99 KiB) Viewed 4646 times
Circle tangent to 3 equal sized circles 2..png
Circle tangent to 3 equal sized circles 2..png (35.94 KiB) Viewed 4646 times
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Re: Tip - Draw a circle tangent to 3 equal sized circles

Postby Husky » Sun Sep 02, 2012 6:02 pm

clive wrote:To draw a circle tangent to 3 equal sized circles (this ones for you Husky :lol: )


Nice! Thank you very much! :D :D :D
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Re: Tip - Draw a circle tangent to 3 equal sized circles

Postby Husky » Thu Aug 08, 2013 7:40 pm

Hey everybody - just an update on this:

The new version of QCAD pro (3.2.0) has a new circle tool set which provides a perfect solution on this.

Two or three clicks .... and done!!!

You have to test it by yourself - absolute amazing!!!! 8)
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Re: Tip - Draw a circle tangent to 3 equal sized circles

Postby Clive » Thu Aug 08, 2013 8:32 pm

Husky wrote:You have to test it by yourself - absolute amazing!!!! 8)

Yes its brilliant, what would be interesting is if it were possible to select all the solutions offered (in one go) :idea: 8) :wink:
@Andrew - would this be possible to add in an option for this ? it would make for very interesting pattern making 8)

3 Tangents tool in use.png
3 Tangents tool in use.png (18.26 KiB) Viewed 2804 times
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Re: Tip - Draw a circle tangent to 3 equal sized circles

Postby caigner » Wed Aug 14, 2013 9:44 am

I just came back from holidays, installed the new version 3.2 and - WOW!!! The new circle tool is brilliant!Superb!

Thanks alot for all the effort which went into this tool!
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