C = (283.0122766325937, 284.83963890788624)
D = (392.7124846978181, 284.5995946889251)
b = Line(C, D)
E = (292.1339569531156, 289.6405232871083)
a = 9.8 (slider from 0 to 20, step 0.1)
c = Circle(E, a)
d = Circle(E, a * 2.0)
e = Circle(E, a * 3.0)
f = Circle(E, a * 4.0)
g = Circle(E, a * 5.0)