Posted by dxli on Jan 27, 2015; 4:16am
URL: https://forum.librecad.org/A-few-simple-questions-tp5711021p5711029.html

to trim by tangential points could be tricky. It may help to draw a construction line (say, by linking the centers of the two tangential circles), and trim by line.

Second question:
"create an ellipse that is tangential to two circles and a line"?

To me, this is not a simple question at all. Given 2 circles and a line, there could be as many as 4 possible common tangential circles (which are tangential to the 2 given circle and the given line).

Now, consider a tangential ellipse, instead of tangential circles, there are two more degree of freedom (say, the eccentricity and the orientation).

Therefore, there are always infinite number of tangential ellipses, if there's existence of one tangential circle.

oneloosecrank wrote

Hi all,
I've just started putting together a design and I've a few questions which should be pretty easy to answer.
How do I trim a circle to create the ends points as the tangents with other circles?
Can I create an ellipse that is tangential to two circles and a line?
Thanks.
OLC