v-u

∡(u,v)

B = (2.822727272727287, 5.80944402704737)
A = (9.668181818181818, 2.666198347107449)
i = Line(B, A)
C = (2.8954545454545495, 1.6458076634109795)
d1, b, c, a = Polygon(C, A, B)
u = Vector(C, A)
v = Vector(C, B)
w = Vector(A, B)
α = Angle(A, C, B)
f = LineBisector(c)
g = LineBisector(a)
γ = Angle(A, C, B)
h_{1} = OrthogonalLine(C, i)
F = Intersect(i, h_{1})
δ = Angle(F, C, B)
ε = Angle(A, C, F)
c_1 = Segment(B, F)
c_2 = Segment(F, A)
h = Segment(C, F)
D = (8.535454545454547, 4.4494440270473605)
E = (10.080909090909092, 4.4494440270473605)