A = (0, 0)
B = (800, 0)
a = CurveCartesian(30 + (50 * t), 40 + (30 * t), t, 0, 8)
t = 6.65 (slider from 0 to 8, step 0.01)
b = CurveCartesian(400 - (20 * t), 250 - (30 * t), t, 0, 8)
C: a(t)
D: b(t)
distanceCD = Distance(C, D)
TextCD: Name[C] + (Name[D]) + " = " + distanceCD
text1 = LaTeX(distanceCD, true, true)
c = Circle(D, 40)