M: (0, 2)
N: (0, 5)
f = Line(M, xAxis)
g = Line(N, xAxis)
C: (0, 8)
B: (11, 0)
a = 4 (slider from 0 to 11, step 0.01)
P: (a, 2)
H: (a, 5)
h = Segment(C, H)
i = Segment(H, P)
j = Segment(P, B)
CH = Distance(C, H)
HP = Distance(H, P)
PB = Distance(P, B)
d: CH + HP + PB