A = Intersect(xAxis, yAxis)
c = Circle(A, 3.75)
r = 1.8 (slider from 0 to 3.75, step 0.01)
d = Circle(A, r)
e = Circle(A, 3.75)
f = Circle(A, r)
B = Intersect(c, d, 1)
C = Intersect(c, d, 1)
D, E = Intersect(f, xAxis)
a = Segment(A, E)
F, G = Intersect(c, xAxis)
b = Segment(E, G)
V1: 4 * π * r^(3) / 3
V2: 3.75^(3) * π * 4 / 3 - V1
texte1: "V air = " + V1 + " cm³"
texte2: "V acier = " * V2 * " cm³"