A = (-1.4, 0.2)
B = (0.52, 2.8)
C = (3.48, 1.9)
poly1, c, a, b = Polygon(A, B, C)
h = 1 (slider from 0 to 5, step 0.1)
e, F, faceABF, faceBCF, faceACF, arêteAF, arêteBF, arêteCF = Pyramid(poly1, h)