Move points I and S to change the shape of the isosceles trapezoid.

A = (-1.36, 5.42)
B = (-0.66, 0.78)
a = Line(A, B)
I = (-2.46, 3.84)
S = (-2.64, -0.62)
P = Mirror(I, a)
T = Mirror(S, a)
poly1, c, d, d', c' = Polygon(I, S, T, P)
PS = Segment(I, T)
IT = Segment(P, S)
O = Intersect(PS, IT)
α = Angle(I, O, S)
b = Segment(I, O)
e = Segment(P, O)
f = Segment(T, O)
g = Segment(S, O)
β = Angle(T, S, I)
γ = Angle(S, I, P)
δ = Angle(I, P, T)
ε = Angle(P, T, S)
h = Segment(I, P)