

Notice, that it is an ellipse.



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...



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 ...



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. ...



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...



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.



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...



