Theory of Machine
Length of arc of contact is given by

Arc of approach × Arc of recess
Arc of approach + Arc of recess
Arc of approach - Arc of recess
Arc of approach / Arc of recess

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Theory of Machine
The contact ratio is given by

(Length of the arc of approach)/cosφ
(Length of the path of approach)/(Circular pitch)
(Length of path of recess)/(Circular pitch)
(Length of the arc of contact)/(Circular pitch)

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