Arc Length In Exercises 57-60, find the arc length of the curve on the interval [0, 27]. 57. Hypocycloid perimeter: x = a cos 0, y = a sin 0 58. Circle circumference: x = a cos 0, y = a sin 6 59. Cycloid arch: x = a(0 - sin ), y = a(1 cos 0) 60. Involute of a circle: x = cos 0 + 0 sin 6, y - = sin 0 - 0 cos 6