The contact ratio is given by
(a) Length of the path of approach/Circular pitch
(b) Length of the path of recess/Circular pitch
(c) Length of the arc of contact/Circular pitch
(d) Length of the arc of approach/cosɸ
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I want to ask this question from Comparison Between Involute and Cycloidal Gears topic in section Toothed Gearing & Gear Trains of Machine Kinematics