For a point F on the circumcircle, the isogonal conjugate is the point at infinity, and the inscribed conic is a parabola. The directrix is the line of reflections of point F, which is the focus of the parabola.
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Triangle Area Formula proof intro
Mia Cervantes - Reflections 1
CALCULUS 1 and 2: RESOURCES !!!
Oughtred (1652): 5 regular solids