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OH^2=OA^2+AH^2=1^2+1^2=2

OH= \sqrt{ 2 } 

\sqrt{ 2 } 

 \sqrt{ 2 } 

O = (2, 4)
B = (8, 4)
a = Ray(O, B)
A = Point(a)
C = Point(a)
b = OrthogonalLine(A, a)
H = Point(b)
c = Segment(O, H)
d = Circle(O, H)
I = Intersect(d, a, 1.0)