N' = N

A = (-0.459016393442623, 9.491803278688526)
B = (-3.3934426229508174, 3.6557377049180326)
C = (7.409836065573775, 3.622950819672131)
t1, c, a, b = Polygon(A, B, C)
O = Center(Circle[A, B, C])
D = Point(a)
M = Intersect(LineBisector[B, D], Line[A, B])
N = Intersect(LineBisector[D, C], Line[A, C])
d = Circle(A, M, N)
s = Segment(M, N)
g = Segment(M, O)
h = Segment(N, O)
i = Segment(A, M)
j = Segment(A, N)