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
Oldham's coupling is the

Second inversion of double slider crank chain
Third inversion of double slider crank chain
Second inversion of single slider crank chain
Third inversion of slider crank chain

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