I don't need help finding an arc length parametrization, first, and most importantly, I need help getting a function r(t) which defines a circle of radius 4, centered at (1,4,10) and in the plane z = 9.
I will begin by defining the circle with r(t) = <4sin(t) + 1, 4cos(t) + 4, 10>
Now how would I get that orientated in the plane z = 9?