Determine the arc length of the cycloid x=r(θ−sinθ)x = r(\theta - \sin \theta)x=r(θ−sinθ), y=r(1−cosθ)y = r(1 - \cos \theta)y=r(1−cosθ) for 0≤θ≤2π0 \leq \theta \leq 2\pi0≤θ≤2π.
4r4r4r
8r8r8r
2πr2\pi r2πr
6r6r6r