a = -0.8257812040718417 (slider from -5 to 5, step 0.1)
b = 2.190507284163059 (slider from -5 to 5, step 0.1)
A: (a, b)
B = (-5, -5)
C = (5, -5)
poly1, b_1, c, d, e, D, E = Polygon(B, C, 4.0)