A: (0, 0)
B: (12, 0)
C: (12, 9)
E: (0, 9)
D: (6, 15)
poly1, a, b, c, d, e = Polygon(A, B, C, D, E)
h = 5.67 (slider from 0 to 9)
M: (6, h)
H: (6, 0)
f = Segment(E, M)
g = Segment(M, C)
i = Segment(M, H)
F: (h, f + g + i)