If we look at the usual pin and string ellipse construction and take the locus of the excenters of the triangle formed by the string, we see that two form lines and the last forms an ellipse.
Expressions
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| Ellipse Locus Eq |  |
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If we look at the usual pin and string ellipse construction and take the locus of the excenters of the triangle formed by the string, we see that two form lines and the last forms an ellipse. Expressions
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