$\sqrt{20}$

$\sqrt{5}$

$\sqrt{20}$

$\sqrt{5}$

a = 

a = 

b =

b =

A = (-0.54, -0.48)
B = Point(Circle[A, sqrt(20)])
b = Segment(A, B)
D = (-0.56, 1.76)
D_{1} = Point(Circle[D, sqrt(5)])
b_{1} = Segment(D, D_{1})
C = Point(Circle[D, sqrt(20)])
a = Segment(D, C)
F = Point(Circle[C, sqrt(5)])
i = Segment(C, F)
e = Segment(D_{1}, C)