Usually X is defined as the intersection point of BL with the polar of L with respect to the circle

with diameter AC, the hypotenuse of the right angled triangle ABC. The figure below indicates the

paths described by various moving points related to the triangle as vertex B varies on the circle

with diameter AC. The parameter a entering the formula is a=AC/2 and the origin is at the middle

O of AC (See Pythagoras.html , Polar.html ).

Bicorn

parametric equations:

x = asin(t),

y = (acos

[Mathcurve, /courbes2d/bicorne/bicorne.shtml].

Polar.html

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