Side Lengths

g = 40 (slider from 20 to 60, step 0.1)
A = (0, 0)
B = Point(Circle[A, g])
a = Segment(A, B)
C: (x(A), y(B))
D: (x(B), y(A))
b = Segment(C, B)
c = Segment(B, D)
d = Segment(A, D)
f = true