Suunnikas ABCD, eli AB ∥ CD sekä BC ∥ AD

T150

A = (4, 4)
B: (3, 0)
C = (10, 0)
D = (11, 4)
m1, a, b, c, d = Polygon(A, B, C, D)
α = Angle(C, B, A)
β = Angle(B, A, D)
f = Line(A, B)
E = Point(f)
γ = Angle(D, A, E)