xm = -100
ym = 0
M: (xm, xm * (320 - xm) / 2)
N: (xm, 0)
L: (0, y(M))
a = Segment(L, M)
b = Segment(M, N)
T1: xm + ""
T2: "" + (y(M))
P: (xm, xm * (320 - xm) / 2)
f = Function(x * (320 - x) / 2, 0, 320)