Pirni ruumala määramine integraali abil

A = (-0.04, -3.81)
B = (8.06, -3.81)
C = (-0.008705550076643892, 0.7415870920817592)
D = (0.3677496439210312, 2.218449776226485)
E = (1.2364923993002812, 3.0727134856827485)
F = (2.221067522063432, 3.6084381848332856)
G = (3.1332474152116445, 3.521563909295361)
H = (4.537714869741433, 3.449168679680423)
I = (5.24718811996782, 3.0147973019907983)
J = (5.826349956887321, 2.117096454765573)
K = (6.391032747883834, 1.9578269496127099)
L = (7.042589814418271, 1.6537669852299721)
M = (7.621751651337771, 1.20491656161736)
N = (7.969248753489472, 0.6836709083898092)
O = (8.014479045922988, 0.7)
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)})
text1: "f\left(x   \right) =  \; " + (LaTeX[f]) + ""
V: (π * Integral[f(x)^(2), 0, 8])
V_{ligikaudne}: round(V)
text2: "V= π \int_{0}^{8}{ f\left(  x \right)^2 \; dx }= \; " + (LaTeX[V]) + "≈" + (LaTeX[V_{ligikaudne}]) + " \; cm^3."