\vec a

\vec n

\vec p

\vec p\,-\, \vec a

\vec{n}^o

A = (-1, 7)
B = (3, 4)
P = (11, -2)
O = Intersect(xAxis, yAxis)
n = Vector(O, B)
f = OrthogonalLine(B, n)
v = Vector(O, P)
w = Vector(O, A)
n_o: (1 / 5 * n)
c = Circle(O, 1)
α = Angle(O, B, P)
u = Vector(A, P)
C: (1 / 5 * B)
D = Point(u)
E = Point(u)
F = (-5.796571263354467, -4.238644156019969)
G = (-3.546215452274121, -4.238644156019969)