a: 4
gl1:=x^(4) = (a * (x^(2) - y^(2)))
b: sqrt(a) / 2
f: y = b
A, E, C, D = Intersect(gl1, f)
g: x = sqrt(a)
B = Intersect(f, g)
h: y = (1 / 2 * x)
F = Point(h)
i = Line(F, E)