a)

B = (31.294084777337787, 0.8577381164886873)
C = (40.6137813549563, 0.7865953945221331)
a = Segment(B, C)
b = OrthogonalLine(B, a)
A = Point(b)
đa giác1, b_1, c, a_1 = Polygon(A, B, C)
β = Angle(C, B, A)
L = (57.3323210170964, -5.224964611651646)
M = (60.46260078362476, -5.189393250668369)
q = Segment(L, M)