S =   \frac{ 1 }{2 }(a+b).h 

A = (35.916195085903865, 6.340513672845604)
B = (47.06781675416115, 6.497027661172021)
a_1 = Segment(A, B)
D = (31.925088383580214, -1.3286717551488731)
b_2 = Segment(A, D)
c = Line(D, a_1)
C = Point(c)
d = Segment(B, C)
e = OrthogonalLine(A, c)
H = Intersect(c, e)
đa giác1, b, b_1, a, c_1 = Polygon(A, B, C, D)
h = Segment(A, H)