排列組合與機率統計(9)
Author: 藍邦偉　老師

n = 0 (slider from 0 to 9, step 1)
A = (-7.539973463414631, -1.2730665560975565)
B: A + (2, 0)
D: A + (0, 1)
C: B + D - A
poly1, a, b, c, d = Polygon(A, B, C, D)