a

b

c

f(b)

f(a)

f(x) = 0.5 * (x - 108)^(3) + 27 * (x - 108)^(2) + 8104
A = Intersect(a, xAxis)
B = Intersect(b, xAxis)
C = Intersect(f, xAxis, 1)
E = Intersect(f, a, 1)
F = Intersect(f, b, 1)
c = OrthogonalLine(E, yAxis)
d = OrthogonalLine(F, yAxis)
G = Intersect(d, yAxis)
H = Intersect(c, yAxis)