Determine the Diagonals

A = (4.969741091039629, 3.5190749290862926)
B = (9.077855836332244, 3.5190749290862926)
poly1, f, g, h, C = Polygon(A, B, 3)
c = Circle(C, A, B)
i = Segment(A, C)
j = Segment(C, B)
P = Point(c)
k = Segment(B, P)
l = Segment(P, A)
sum: k + l
m = Segment(C, P)
text1: "k+l=" + (LaTeX[sum]) + "=m"
n = Segment(A, B)
α = Angle(A, C, B)