P = (-3, 1)
Q = (5, -2)
o = Line(P, Q)
g = OrthogonalLine(P, o)
B = Point(o)
A = (1, 1)
U = (-1, 3)
S = (3, 3)
A' = Kolineacia(A, S, o, U)
f = Line(S, A')
h = Line(U, o)

Tool: Kolinecia (S,o,U) (command Kolineacia)
Bod, stred, os PQ, ubeznik
Input: L, S, o, U
Output: L'

h = Line(S, L)
u = Line(U, o)
B = Point(o)
j = Line(L, B)
C = Intersect(j, u)
k = Line(S, C)
l = Line(B, k)
L' = Intersect(l, h)