\overrightarrow{E}

A: (-1, 1)
B: (1, 1)
c = Semicircle(A, B)
u = Vector((0, 2), (0.3, 2))
C = (-0.8339085472313482, 1.3342801747833817)
E = Vector(C, C + (y(C)^(2), x(C)^(2)))
F = Midpoint(C, C + E)