A = (0, -4.4)
B = (11.94, -4.4)
C = (0.0508, 1.2158)
D = (0.7042, 2.9098)
E = (2, 4)
F = (3.6808, 4.7006)
G = (5.157, 4.9668)
H = (6.5606, 4.9184)
I = (8.1094, 4.6038)
J = (9.2468, 4.265)
K = (10.3842, 3.9988)
L = (11.1102, 3.1276)
M = (11.812, 2.6436)
N = (12, 2)
O = (12.0056, 0.272)
f = Fit({C, D, E, F, G, H, I, J, K, L, M, N, O}, {1, x, x^(2), x^(3), x^(4), x^(5), x^(6), x^(7), x^(8)})
V: (π * Integral[(f(x))^(2), 0, 12])