$f_1$

$f_2$

$f_3$

Graph 4

A = Point(xAxis)
gl1: x = x(A)
f1(x) = (-x) + 1
f2(x) = 1
B = Point(gl1)
u = Vector(B, (0, y(B)))
f = Segment(A, B)
a = false
b = false
c = false
f3(x) = abs(x)
d = false
e = Circle((0, 0), 2)