prod = 11.8 (slider from 1 to 50, step 0.1)
p = 5.6 (slider from -20 to 20, step 0.1)
q: prod / p
s = -2 (slider from -5 to 5, step 1)
t: -(prod / s)
A: (p, s)
B: (q, t)
C = Midpoint(A, B)
c = Circle(C, A)