HUOM!
CF = CD samoin BF = BA (tasakylk. kolmio)
AF = FD (tasakylk. kolmio)

T118

A = (2, 3)
B = (2, -1)
C = (6, -1)
D = (6, 3)
m1, a, b, c, d = Polygon(A, B, C, D)
e = Circle(B, C)
f = Circle(C, B)
E, F = Intersect(f, e)
k1, c_1, b_1, f_1 = Polygon(B, F, C)