A = (2.56, 1.82)
B = (1.24, -4.24)
C = (8.76, -2.34)
t1, c, a, b = Polygon(A, B, C)
O = (11, 0)
k = 1 (slider from -3 to 3, step 0.5)
A' = Dilate(A, k, O)
B' = Dilate(B, k, O)
C' = Dilate(C, k, O)
t1', c', a', b' = Polygon(A', B', C')
f = Line(O, A)
g = Line(O, C)
h = Line(O, B)