Tassi ruumala määramine integraali abil

A: (0, -3.6)
B = (14.2, -3.6)
C = Point(yAxis)
D = (0.6253989087301812, 1.6722875127084236)
E = (1.3025712454254732, 1.9489207413132639)
F = (2.166935877112817, 1.8612692530069899)
G = (2.841264383357334, 1.7985353279804286)
H = (4.0059494591726015, 1.8109255947444207)
I = (5.381269069975737, 1.9596087959123272)
J = (6.558344412554996, 2.269365465012132)
K = (7.6982489548422794, 2.6782442682238745)
L = (8.60273842861371, 2.9632204037956953)
M = (9.804594304720954, 3.2729770728955003)
N = (11.285650652469313, 3.407123351330905)
O = (13.385323578595706, 3.273854378910341)
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, 13])
V_{ligikaudne}: round(V)
text2: "V= π \int_{0}^{13}{f\left(  x \right)^2 \; dx  }= \; " + (LaTeX[V]) + "≈" + (LaTeX[V_{ligikaudne}]) + " \; cm^3."