Seebi ruumala määramine integraali abil

\shadowbox{Joone\;y=f(x)\;pööramisel\;ümber\;x-telje\;rajades\
x=a\;kuni\;x=b\;saame\;pöördkeha\;ruumala\
V= π \int_{a}^{b}{f^{2}(x)\;dx.}}

\ovalbox{Veega\;ääreni\;täidetud\;nõu\;kaal:698\;g.\
Veega\;osaliselt\;täidetud\;nõu\;kaal\;peale\;seebi\;väljavõtmist:655\;g.\
Seebi\;poolt\;väljatõrjutud\;vee\;kaal:43\;g.}

A = (0, -1.8113497188209302)
B = (6.5, -1.8113497188209302)
C = (0.19793889122735836, 0.34924880027127037)
D = (0.5854687483636456, 0.856018613449491)
E = (1.1578205373649313, 1.3031684486067447)
F = (1.8255642911997645, 1.589344343107387)
G = (2.487346047232501, 1.7443562859619015)
H = (3.0000778582128196, 1.7741662749723852)
I = (3.5008856735889444, 1.7860902705765787)
J = (4.001693488965069, 1.7503182837639983)
K = (4.508463302143291, 1.6549263189304508)
L = (5, 1.5)
M = (5.504116935093444, 1.1898904903669072)
N = (6.022810743875859, 0.7427406552096535)
O = (6.380530612001663, 0.1644268684062722)
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, 6.5])
tekst2: "f\left(  x \right) =" + (LaTeX[f]) + ""
tekst4: "\doublebox{Antud\; seebi\; puhul\;V=π \int_{0}^{6.5}{f^{2}(x)\;dx≈" + (LaTeX[V]) + "\;cm^{3}}"