b = 3
a = 2 (slider from -300 to 300, step 0.1)
T1: "" + a
A: (a, b)
T2: "" + b
c = Line(A, yAxis)
d = Line(A, xAxis)
B = Intersect(c, xAxis)
C = Intersect(d, yAxis)
e = Segment(C, A)
f = Segment(A, B)
D = Intersect(xAxis, yAxis)
g = Segment(D, B)
h = Segment(D, C)
E = Midpoint(g)
F = Midpoint(h)
T3: "A ( " + a + " , " + b + " )"