Ellipses

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Notice, that it is an ellipse.
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If we look at the usual pin and string ellipse construction and take the locus of the incenters of the triangle formed by the string, we see it also i...
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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 ...
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One of two parallel sides of a trapezium is given in magnitude and position, the other in magnitude. The sum of the remaining two sides is given. ...
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We create a tangent, then a line HL through the center of the ellipse parallel to the tangent. We then intersect the original tangent with the tangen...
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The intersection of the normals at the ends of a focal chord lies on a line parallel to the major axis through the midpoint of the chord.
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Maclaurin constructs a conic section by passing a triangle through 3 fixed points, while running two of its vertices along fixed lines, and taking the...
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