1. The problem statement, all variables and given/known data Find an arc length parametrization of the circle in the plane z=5 with radius 6 and center (4,1,5) 2. Relevant equations ||r'(t)||=r'(u) s=integral r'(u)du 3. The attempt at a solution I get the equation of the circle to be (x-4)^2+(y-1)^2+(z-5)^2=6^2 Not sure where to go from here. Make x=t and then solve for y and z? That seems like to mcuh work for this problem. What am I missing?