4

4

A = (1, 1)
c = Circle(A, 2.0)
B = (-1, 3)
C = (-1, -1)
D = (3, -1)
E = (3, 3)
a = Segment(B, E)
b = Segment(B, C)
d = Segment(C, D)
e = Segment(D, E)
M = (1, 1)
r = 0.5 (slider from 0 to 8, step 0.5)
f = Circle(M, r)