Theory of Machine
In involute gears, the pressure angle is

Dependent on the size of teeth
Always constant
Dependent on the size of gears
Always variable

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Theory of Machine
The contact ratio is given by

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

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