T501ab_502a

f: y = x
a = Integral(x, 0, 3)
p = 6.2 (slider from 0 to (2 * pi))
b = Surface(t, (t * cos(s)), (t * sin(s)), t, 0, 3, s, 0, p)
g(x) = sqrt(x)
c = Surface(t, (g(t) * cos(s)), (g(t) * sin(s)), t, 0, 4, s, 0, p)
d = Surface(t, (t * cos(s)), (t * sin(s)), t, -2, 2, s, 0, p)