f(x) = (0.25 * x^(2)) + 1
c = 4 (slider from 0 to 4)
d: f(c)
B: (c, d)
A: (c, 0)
g = Segment(A, B)
C = (0, 0)
D: (0, f(0))
h = Segment(C, D)
distanceAB = Distance(A, B)
e = Circle(A, Distance[A, B], xAxis)