a = -0.3142986883919184 (slider from -1 to 2, step 0.01)
b = 1.324984666750244 (slider from -0.5 to 1.5, step 0.01)
C = (-0.09477634614820105, -0.13455742971388782)
B: (a + x(C), b + y(C))
lista1: {Polygon[C - (1.0, 0.5), C + (-1.0 * 1.0 * 1.0, 1.5), C + (2.0, 1.5), C + (2.0, -1.0 * 1.0 * 0.5)]}