20 \vec{ i } 

20 \vec{ j } 

20 \vec{ k } 

O = Intersect(xAxis, yAxis)
B_1 = (-2, -1)
a = Line(O, B_1)
C_1 = Point(a)
D = Point(xAxis)
u = Vector(O, C_1)
v = Vector(O, D)
E = Point(yAxis)
w = Vector(O, E)
A = Point(xAxis)
B = (17, 10)
C = (8, 10)
F = (-4, -5)
G = (5, -5)
poly1, f, c, b, g = Polygon(F, C, B, G)
H = Point(a)
I = Point(f)
φ = Angle(H, O, I)
J = Intersect(b, a)
d = Segment(O, J)
K = Point(a)
e = Ray(O, K)
L = Point(a)
h = Ray(J, L)